In this photo taken Tuesday, April 23, 2019, provided by Don Draper, a victim of a car crash is offered assistance from police in Sunnyvale, Calif. Draper, a witness to the crash that injured several people, said he was waiting for the light to turn green when a Toyota Corolla plowed through the intersection at high speed.  (Don Draper via AP)

SUNNYVALE, Calif. (AP) — A former Army sharpshooter with a history of post-traumatic stress disorder plowed his car at high speed into a group of pedestrians in a Silicon Valley suburb, injuring eight people, then told authorities that he intentionally hit them, police said.

Isaiah Joel Peoples, 34, gave no indication why he targeted the group in Sunnyvale, California, authorities said. He was charged Thursday with eight counts of attempted murder. Four of the pedestrians remained hospitalized, including a 13-year-old girl who was in critical condition. Peoples was jailed without bond and scheduled to appear in court Friday.

A witness said he watched in horror as the car sped through a crosswalk in a shopping area Tuesday evening and bodies went flying. It was a warm night, around dinnertime, and people were out in cafes and restaurants.

"I saw this woman fly through the air right in front of me. She flipped upside down and then fell right in front of my car," Don Draper said. He marched over to Peoples' car, which had swerved onto a sidewalk and crashed into a tree. He said Peoples did not appear drunk but looked dazed and was mumbling over and over, "Thank you, Jesus. Thank you, Jesus."

Sunnyvale Police Chief Phan Ngo declined to discuss details of interviews with Peoples and said police are still working to determine his motivation.

"When we took him into custody, he did not behave in any manner that would be considered bizarre," Ngo said. "He has not shown any remorse."

Though the FBI was assisting in the investigation, there was no evidence linking Peoples to any terrorist organization and, so far, no evidence of a federal crime, said Ngo, who said Peoples had picked up food and was on his way to deliver it to his Bible study group.

Investigators were processing evidence found Wednesday in a search of Peoples' apartment in Sunnyvale, about 50 miles (80 kilometers) south of San Francisco. Police also gave him a blood test for drugs and were checking into accounts from family members that he had a history of mental illness.

Family and friends described Peoples as quiet and polite and expressed shock at his involvement.

His mother, Leevell Peoples of Sacramento, said she could not imagine any situation in which her son would deliberately crash into innocent people other than something related to the PTSD she said he experienced after serving in Iraq.

"Unless the car malfunctioned, he would not have done that. He's like the perfect, model citizen," she said.

Her son graduated from Sacramento State University after returning from Iraq in 2007 and was working as an auditor for the Defense Department in nearby Mountain View, she said.

"He basically probably has no friends but the people he works with," she said. "He's an Army vet. He's a good kid, never been arrested. I promise you: It was not deliberate. If anything, it was that Army."

She said Peoples had "a bad episode" with PTSD in 2015, for which he was hospitalized, and has told her that he had been taking medication regularly since then.

The mother said the Army forced her son to retire because of PTSD. Pentagon spokeswoman Lt. Col Carla Gleason confirmed that he retired from the Army.

Peoples served as a civil affairs specialist in the Army Reserve from March 2004 to July 2009 and attained the rank of sergeant, and he was deployed to Iraq from June 2005 to May 2006, according to another Pentagon spokesman, Lt. Col. Emanuel Ortiz. He did not answer questions about whether Peoples' departure from the Army was due to PTSD.

Peoples was honorably discharged from the Army, and police were investigating the PTSD report, Ngo said. Peoples had no criminal record and owned one weapon, a disassembled and inoperable shotgun that was in the trunk of his vehicle, according to the police chief.

Other witness statements matched Draper's account that the driver was speeding and drove directly toward the pedestrians without trying to veer away or stop.

Six people were taken to hospitals, including the youngest victim, a 9-year-old boy who was treated and released.

Miguel Balbuena, 15, was on his bike waiting to cross when he heard a woman scream. He tried to get out of the way but failed. He was on crutches after a metal pole squeezed his leg.

"It's not something you see every day," he told television station KTVU, saying it was like a scene out of a movie. "It was really hard to see."

Isaiah Peoples' former housemate Chuck Herrera described him as quiet — someone who had to be coaxed into going out for drinks or dinner. He said Peoples was kind to Herrera's toddler son.

He recalls Peoples "always had a lot of pills" and a cough.

"The guy I met was not someone who you think will hurt someone," he said. "My guess is something happened."

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Har reported from San Francisco. Associated Press writers Olga R. Rodriguez and Juliet Williams in San Francisco also contributed to this report.

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This story has been corrected to eliminate language that erroneously indicated authorities were investigating whether a police captain had a history of mental illness. The investigation was focused on the suspect, whose family members described such a history.

In this photo taken Tuesday, April 23, 2019 provided by Don Draper, an officer works the scene of a car crash that injured several people in Sunnyvale, Calif. A former Army sharpshooter with a history of post-traumatic stress disorder plowed his car at high speed into a group of pedestrians in the Silicon Valley suburb, and then told authorities that he intentionally hit them, police said. (Don Draper via AP)
This photo taken Tuesday, April 23, 2019, provided by Don Draper, shows the scene of a car crash where several pedestrians were struck in Sunnyvale, Calif. Draper, a witness to the crash said he was waiting for the light to turn green when a vehicle plowed through the intersection at high speed. (Don Draper via AP)
In this photo taken Tuesday, April 23, 2019, provided by Don Draper, a victim of a car crash is offered assistance in Sunnyvale, Calif. Draper, a witness to the crash that injured several people, said he was waiting for the light to turn green when a vehicle plowed through the intersection at high speed. (Don Draper via AP)
In this photo taken Tuesday, April 23, 2019, provided by Don Draper, Isaiah Joel Peoples, the driver of a car that struck several pedestrians, lays on the ground after the crash in Sunnyvale, Calif. The former Army sharpshooter with a history of post-traumatic stress disorder plowed his car at high speed into a group of pedestrians in the Silicon Valley suburb and then told authorities that he intentionally hit them, police said.  (Don Draper via AP)
In this photo taken Tuesday, April 23, 2019 provided by Don Draper, a victim of a car crash is treated by paramedics in Sunnyvale, Calif. Draper, a witness to the crash that injured several people, said he was waiting for the light to turn green when a vehicle plowed through the intersection at high speed.  (Don Draper via AP)
This photo released Wednesday, April 24, 2019, by the Sunnyvale Department of Public Safety shows Isaiah Joel Peoples. Police in Northern California have identified the man arrested after he allegedly deliberately plowed into a group of people. The Sunnyvale Department of Public Safety says 34-year-old Peoples, of Sunnyvale, Calif., was arrested Tuesday. (Sunnyvale Department of Public Safety via AP)
Leevell Peoples glances at a photo of her son, Isaiah Peoples, taken while he was in the Army, at her home Wednesday, April 24, 2019, in Sacramento, Calif. Isaiah Peoples, 34, was taken into custody by Sunnyvale Police after he allegedly deliberately plowed into a group of people injuring them on Tuesday. Leevell Peoples says her son is a
Police carry away items after investigating the apartment complex believed to be associated with a car crash suspect in Sunnyvale, Calif., on Weds., April 24, 2019. A California man who authorities said drove into a crosswalk in a quiet Silicon Valley suburb is an Iraqi war veteran who suffers from post-traumatic stress disorder, his mother told The Associated Press on Wednesday. (AP Photo/Cody Glenn)
Police vehicles surround the apartment complex believed to be associated with a car crash suspect in Sunnyvale, Calif., Wednesday, April 24, 2019. A witness to a California crash that injured eight people said Wednesday he was waiting for a traffic light to turn green when a Toyota Corolla plowed through the intersection at a high speed, sending pedestrians flying into the air in the Silicon Valley city of Sunnyvale. (AP Photo/Cody Glenn)
Police work the apartment complex believed to be associated with a car crash suspect in Sunnyvale, Calif., on Wednesday, April 24, 2019. Investigators are working to determine the cause of a crash in Northern California that injured eight pedestrians on Tuesday evening. Authorities say the driver of a car was taken into custody after he appeared to deliberately plow into them. (AP Photo/Cody Glenn)