In this combo photo released by Italian Carabinieri, Gabriel Christian Natale Hjorth, right, and Finnegan Lee Elder, sit in their hotel room in Rome. Two American teenagers were jailed in Rome on Saturday as authorities carry out a murder investigation in the killing of Italian police officer Mario Cerciello Rega, 35. A detention order issued by prosecutors was shown on Italian state broadcaster RAI, naming the suspects as Gabriel Christian Natale Hjorth and Finnegan Lee Elder. (Italian Carabinieri via AP)

ROME (AP) — Two American teenagers who were classmates at a California high school spent a second night in a Rome jail Saturday after they were interrogated for hours about their alleged roles in the murder of an Italian policeman.

Investigators contended in written statements Saturday that the pair had confessed to their roles in the grisly slaying. Vice Brigadier Mario Cerciello Rega, a member of the storied Carabinieri paramilitary corps, was stabbed eight times, allegedly by one of the teens, leaving him bleeding on a street close to the teens' upscale hotel near Rome's Tiber River.

Italian authorities identified the two as Gabriel Christian Natale-Hjorth, 18, and Finnegan Lee Elder, 19, and said they were born in San Francisco.

Police said they were apparently vacationing in the Italian capital without family members.

In the detention order, Elder is described as repeatedly stabbing the 35-year-old officer, who had just returned to duty a few days earlier from his honeymoon.

Investigators said Cerciello Rega, along with another Carabinieri officer, were both in plainclothes when they confronted the Americans about 3 a.m. Friday in the wake of a drug deal gone wrong.

Natale-Hjorth was described in the document as having repeatedly punched Cerciello Rega's partner.

Under Italian law, persons participating in a killing, but who didn't actually carry out the slaying itself, risk being charged with murder.

Both suspects are also being investigated for attempted extortion.

Cerciello Rega, beloved for his charity work with the homeless and the ailing, was praised as a hero for trying to help keep Rome's streets safe.

Photos of the officer, wearing his uniform for his wedding and showing off his wedding band as he sat next to his beaming bride, dominated the front pages of many Italian newspapers Saturday.

Parents with their children left bouquets of flowers at the bloodstained site.

Authorities vowed that justice would be done.

"Hoping that the killer of our poor Carabiniere never gets out of prison, I remind do-gooders that in the United States, whoever kills risks the death penalty," tweeted Interior Minister Matteo Salvini, who is also in charge of state police, another national Italian police corps. "I'm not saying we'll get to that, but yes to a life in prison (in labor, obviously)."

Like all European Union countries, Italy doesn't have the death penalty.

Elder's lawyer, Francesco Codini, said his client had exercised his right not to respond to questions during a hearing before a judge at the jail Saturday to determine whether the suspects remain locked up.

Italian state radio reported Sunday the judge ruled that the Americans stay in jail while the investigation goes forward.

Suspects deemed a flight risk are often denied release. Italian police had said the two teens were preparing to leave Italy later on Friday.

Codini declined to say anything more out of "respect for the family" of the slain officer. Asked how Elder was doing psychologically, he replied: "worn out."

Natale-Hjorth's lawyer didn't speak to reporters waiting outside the jail after the hearing.

The young men were high school classmates in Mill Valley, a wealthy suburb 10 miles (16 kilometers) north of San Francisco en route to the towering redwood trees in Muir Woods National Park. The town of 14,000 is a desirable destination for families who are drawn to its safe, leafy neighborhoods and reputable public schools.

"We are shocked and dismayed at the events that have been reported, but we have very little independent information about these events," Elder's family said in a statement. "We have not been able to have any communication with our son."

The family expressed condolences to the policeman's family and "all of those who have been impacted by this tragedy."

At a house listed for the mother of Natale-Hjorth, a young man who answered the door yelled "No!" when an Associated Press reporter asked to speak to her.

An Italian investigator said the pair had snatched the bag of a drug dealer in Rome after the man apparently gave them a different substance instead of the cocaine they were seeking. The person spoke on condition of anonymity because the probe is continuing.

In a statement, the Carabinieri contended that the Americans demanded cash and cocaine to return the knapsack. They said the bag, with a phone inside, was snatched from an Italian man. The Americans, police said, "threatened to not give it back to him without payment of 100 euros and a gram of cocaine."

The bag's owner reported the theft, and the plainclothes officers were sent to the site of the rendezvous to allegedly turn over the bag for ransom, the statement said.

The Americans, "even though the officers identified themselves as being Carabinieri, didn't hesitate to engage in a struggle, culminating in the mortal wounding" of the policeman, the statement said.

Italian police officers carry guns, but it was unclear why they weren't used.

The Carabinieri said surveillance cameras and witnesses helped them identify and find the Americans. While searching their hotel room, police said, investigators found a long knife hidden inside the room's dropped ceiling. Also found were clothes worn during the attack, police said.

The Carabinieri statement said the Americans during their interrogation and confronted with "hard evidence," had "confessed to their blame."

This case could spark comparisons to another spectacular slaying investigation involving a young American in Italy.

Amanda Knox was an American university student in Perugia when she was initially accused in the 2007 stabbing death of her British roommate Meredith Kercher. She was convicted but ultimately acquitted.

Italian media focused on Knox, largely ignoring the fate of the Briton. In contrast, a decade later, the murder victim is an Italian policeman at a time when Salvini's law-and-order right-wing party is soaring in popularity.

"Hero of the Fatherland, justice for Mario," read a note, signed by the "neighborhood citizens" and left near the scene of his death.

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Giada Zampano, Dolores Hinckley and Associated Press writer Daisy Nguyen contributed to this report.

In this photo released by Carabinieri, is portrayed officer Mario Cerciello Rega, 35, who was stabbed to death in Rome early Friday, July 26, 2019. Italian police said Saturday that two 19-year-old American tourists have confessed to fatally stabbing the Italian paramilitary policeman who was investigating the theft of a bag with a cellphone.
A woman leaves flowers in front of the Carabinieri station where Mario Cerciello Rega was based, in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American turists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
A woman leaves flowers in front of the Carabinieri station where Mario Cerciello Rega was based, in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American turists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
A man leaves flowers in front of the Carabinieri station where Mario Cerciello Rega was based, in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American turists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
In this picture taken Friday, July 26, 2019 investigators are seen on the scene where an Italian paramilitary policeman was stabbed to death. A young American tourist has confessed Saturday, July 27, 2019, to fatally stabbing an Italian paramilitary policeman who was investigating the theft of a bag and cellphone before dawn Friday, (Angelo Carconi/ANSA via AP)
In this picture taken Friday, July 26, 2019 investigators are seen on the scene where an Italian paramilitary policeman was stabbed to death. A young American tourist has confessed Saturday, July 27, 2019, to fatally stabbing an Italian paramilitary policeman who was investigating the theft of a bag and cellphone before dawn Friday, (Angelo Carconi/ANSA via AP)
In this picture taken Friday, July 26, 2019 investigators are seen on the scene where an Italian paramilitary policeman was stabbed to death. A young American tourist has confessed Saturday, July 27, 2019, to fatally stabbing an Italian paramilitary policeman who was investigating the theft of a bag and cellphone before dawn Friday, (Angelo Carconi/ANSA via AP)
A man leaves flowers in front of the Carabinieri station where Mario Cerciello Rega was based, in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American turists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
Sandro Ottaviani, commander of the station, stands near flowers left by Roman citizens in front of the Carabinieri station where Mario Cerciello Rega was based, in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American turists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
A woman leaves a note in memory on the spot where Mario Cerciello Rega was stabbed to death, in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American turists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
People stop by flowers and messages left on the spot, in Rome, Saturday, July 27, 2019, where Carabinieri officer Mario Cerciello Rega was stabbed to death early Friday. In a statement Saturday, Carabinieri officers investigating the death of Cerciello Rega, 35, said two young American tourists have been detained for alleged murder and attempted extortion. (Angelo Carconi/ANSA via AP)
Flowers and messages left by Roman citizens on the spot where Mario Cerciello Rega was stabbed to death, in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American turists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
A man wipes his eyes after leaving flowers on the spot where Mario Cerciello Rega was stabbed to death, in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American turists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
A cameraman waits at the entrance of the Regina Coeli prison, where the alleged murderer of carabiniere Mario Cerciello Rega, who was stabbed to death, are detained in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American tourists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
Flowers and messages are left on the spot, in Rome, Saturday, July 27, 2019, where Carabinieri officer Mario Cerciello Rega was stabbed to death early Friday. In a statement Saturday, Carabinieri officers investigating the death of Cerciello Rega, 35, said two young American tourists have been detained for alleged murder and attempted extortion. Ticket at left reads in Italian:
A view from the above of the Regina Coeli prison, where the alleged murderers of carabiniere Mario Cerciello Rega, who was stabbed to death, are detained in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American tourists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
A view from the above of the Regina Coeli prison, where the alleged murderers of carabiniere Mario Cerciello Rega, who was stabbed to death, are detained in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American tourists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
A view from the above of the Regina Coeli prison, where the alleged murderers of carabiniere Mario Cerciello Rega, who was stabbed to death, are detained in Rome, Saturday, July 27, 2019. In a statement Saturday, Carabinieri officers investigating the death Friday of officer Cerciello Rega, 35, said two American tourists, both 19, have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)
In this photo release by Italian Carabinieri, Finnegan Lee Elder sits in his hotel room in Rome. Two American teenagers were jailed in Rome on Saturday as authorities carry out a murder investigation in the killing of Italian police officer Mario Cerciello Rega, 35. A detention order issued by prosecutors was shown on Italian state broadcaster RAI, naming the suspects as Gabriel Christian Natale Hjorth and Finnegan Lee Elder. (Italian Carabinieri via AP)
In this photo release by Italian Carabinieri, Gabriel Christian Natale Hjorth sits in his hotel room in Rome. Two American teenagers were jailed in Rome on Saturday as authorities carry out a murder investigation in the killing of Italian police officer Mario Cerciello Rega, 35. A detention order issued by prosecutors was shown on Italian state broadcaster RAI, naming the suspects as Gabriel Christian Natale Hjorth and Finnegan Lee Elder. (Italian Carabinieri via AP)