A man is evacuated by medics past graffiti of Pepe the Frog, which has been used a s symbol of the youth-led protest, from the Polytechnic University in Hong Kong on Wednesday, Nov. 20, 2019. Hong Kong schools have reopened after a six-day shutdown but students were facing transit disruptions as the last protesters remained holed up on a university campus. (AP Photo/Ng Han Guan)

HONG KONG (AP) — Hong Kong schools reopened Wednesday after a six-day shutdown, but students and commuters faced transit disruptions as the last anti-government protesters remained holed up on a university campus, surrounded by police.

City officials tried to restore a sense of normalcy as primary and secondary classes resumed. Workers began cleaning up debris blocking a major road tunnel, but it was unclear when it would reopen. Officials warned protesters not to disrupt elections scheduled for the weekend.

A small group of protesters refused to leave Hong Kong Polytechnic University, the remnants of hundreds who took over the campus for several days. They won’t leave because they would face arrest, and police have set up a cordon around the area to prevent anyone from escaping.

The occupation of Polytechnic capped more than a week of intense protests, the latest flareup in the often-violent unrest that has gripped the semi-autonomous Chinese city for more than five months.

Also Wednesday, a former British Consulate employee said he was detained in mainland China and tortured by secret police trying to extract information about activists involved in the movement — revelations sure to add to protesters’ fears about Beijing’s tightening grip.

Since a police siege of the campus began Sunday, police have arrested 700 people who left campus to surrender, while another 300 minors were allowed to go home but may still face prosecution, Chief Superintendent Ricky Ho told reporters.

Among those arrested were people involved in an apparent escape attempt through a sewer. Ho said officers saw four people remove a manhole cover and lower a rope into the drain to help two others climb out. Ho said all were arrested but did not give further details.

It was unclear how many protesters remained on campus, but they appeared to number fewer than 100. About two dozen scrounged through supplies in the cafeteria looking for food in the morning. Trash littered public areas, and a stench permeated the campus.

One protester, who spoke on condition of anonymity because he fears arrest, remained adamant.

“I think if you go out and surrender, it just shows you agree with what the police and that government are doing or have given up the fight,” he said.

There were scattered incidents of protesters stopping trains by opening emergency doors and blocking traffic, but on a much smaller scale than last week.

Television footage showed long lines at some stations because of train delays. A few stations remained shut by damage from earlier protests.

A group of protesters, joined by students in uniform, blocked traffic at one intersection. Others in the area argued with them, removing some of the metal barriers that protesters carried into the street.

Even as the latest violence wound down, a fundamental divide suggested the protests in the former British colony are far from over.

Office workers joined protesters at lunch time in the central business district to show support for the movement, as they have every day since last week. Police kept the crowds on the sidewalks, so they wouldn’t block traffic.

Hong Kong’s protests began in June over an extradition bill that would have allowed suspects to be sent to China to face trial. Opponents saw it as a threat to the “one country, two systems” framework that gives Hong Kong its relative autonomy.

The bill has been withdrawn, but protesters now demand fully democratic elections and an independent investigation into police actions in suppressing the protests. City leaders have rejected these demands and said violence must stop before meaningful dialogue can begin.

Protesters also have called on the government not to cancel Sunday’s neighborhood council elections. Chief Secretary Matthew Cheung, Hong Kong’s No. 2 official, said officials are “extremely keen” to hold the vote.

“But much depends on the cooperation of violent protesters. It takes two to tango,” he said, adding that blocking roads and disrupting traffic will make it hard for people to vote and “then it will really ruin this election.”

The city sent inspectors to examine the damage to the city’s Cross-Harbour Tunnel, as workers used heavy equipment to remove the debris left on the approach road.

Protesters set fire to the toll booths during their occupation of Polytechnic University that overlooks the approach to the tunnel, one of three connecting Hong Kong Island with the rest of the city.

The Hong Kong government joined China in condemning passage of legislation by the U.S. Senate that mandates sanctions on Chinese and Hong Kong officials who commit human rights abuses and requires an annual review of the favorable trade status that the U.S. grants Hong Kong.

“The passage of this bill is an important step in holding accountable those Chinese and Hong Kong government officials responsible for Hong Kong’s eroding autonomy and human rights violations,” said Sen. Marco Rubio.

Chinese Foreign Ministry spokesman Geng Shuang said in a statement that the aim of the bill was to “bolster anti-China, extremist and violent radicals who attempt to disrupt Hong Kong (and) damage Hong Kong's prosperity and stability” as part of a plot to contain China’s development.

A Hong Kong government statement called the legislation “unnecessary and unwarranted” and said it would “harm the relations and common interests between Hong Kong and the U.S.”

Organizers said they’ve postponed the Hong Kong Open golf tournament because of the unrest, the latest in a string of disrupted public events. But in a rare boost for the economy, Chinese e-commerce giant Alibaba raised at least $11 billion in the city’s biggest share offering since 2010.

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Associated Press journalist Alice Fung and Kelvin Chan in London contributed.

Belonging of protesters are left in the campus of the Polytechnic University in Hong Kong, Wednesday, Nov. 20, 2019. A small group of protesters refused to leave Hong Kong Polytechnic University, the remnants of hundreds who took over the campus for several days. They won't leave because they would face arrest. Police have set up a cordon around the area to prevent anyone from escaping. (AP Photo/Ahmad Ibrahim)
President of the Polytechnic University Jin-Guang Teng, second from right, looks as an injured protester is helped by medics to leave the campus in Hong Kong on Wednesday, Nov. 20, 2019. A small group of protesters refused to leave Hong Kong Polytechnic University, the remnants of hundreds who took over the campus for several days. They won't leave because they would face arrest. Police have set up a cordon around the area to prevent anyone from escaping. (AP Photo/Ng Han Guan)
Workers inspect the damage from protesters on the toll booths of the Cross-Harbor Tunnel near the Polytechnic University in Hong Kong on Wednesday, Nov. 20, 2019. A small group of protesters refused to leave Hong Kong Polytechnic University, the remnants of hundreds who took over the campus for several days. They won't leave because they would face arrest. Police have set up a cordon around the area to prevent anyone from escaping. (AP Photo/Ng Han Guan)
Protesters rest in a gymnasium on the campus of the Polytechnic University in Hong Kong on Wednesday, Nov. 20, 2019. A small group of protesters refused to leave Hong Kong Polytechnic University, the remnants of hundreds who took over the campus for several days. They won't leave because they would face arrest. Police have set up a cordon around the area to prevent anyone from escaping. (AP Photo/Ng Han Guan)
A police officer watches the Polytechnic University entrance in Hong Kong on Wednesday, Nov. 20, 2019. A small group of protesters refused to leave Hong Kong Polytechnic University, the remnants of hundreds who took over the campus for several days. They won't leave because they would face arrest. Police have set up a cordon around the area to prevent anyone from escaping. (AP Photo/Ng Han Guan)
Riot police pass as workers clear the road in front of the Polytechnic University in Hong Kong on Wednesday, Nov. 20, 2019. A small group of protesters refused to leave Hong Kong Polytechnic University, the remnants of hundreds who took over the campus for several days. They won't leave because they would face arrest. Police have set up a cordon around the area to prevent anyone from escaping. (AP Photo/Ng Han Guan)
Workers remove a board with the words referring to the police force
Medical workers transport an injured protester on a stretcher near Hong Kong Polytechnic University in Hong Kong, Tuesday, Nov. 19, 2019. A small band of anti-government protesters, their numbers diminished by surrenders and failed escape attempts, remained holed up at a Hong Kong university early Wednesday as they braced for the endgame in a police siege of the campus. (AP Photo/Achmad Ibrahim)
President of the Polytechnic University Jin-Guang Teng speaks to the media at the campus in Hong Kong on Wednesday, Nov. 20, 2019. A small group of protesters refused to leave the Polytechnic University, the remnants of hundreds who took over the campus for several days. They won't leave because they would face arrest. Police have set up a cordon around the area to prevent anyone from escaping. (AP Photo/Ng Han Guan)
Riot police gather near a Louis Vuitton store during a demonstration in the financial district in Hong Kong, Wednesday, Nov. 20, 2019. Hong Kong schools reopened Wednesday after a six-day shutdown but students and commuters faced transit disruptions as the last protesters remained holed up on a university campus. (AP Photo/Kin Cheung)
Protesters hold up their hands to symbolize pro-democracy demonstrators' five demands during a demonstration in the financial district in Hong Kong, Wednesday, Nov. 20, 2019. Hong Kong schools reopened Wednesday after a six-day shutdown but students and commuters faced transit disruptions as the last protesters remained holed up on a university campus. (AP Photo/Kin Cheung)
A protester holds an American flag during a demonstration in the financial district in Hong Kong, Wednesday, Nov. 20, 2019. Hong Kong schools reopened Wednesday after a six-day shutdown but students and commuters faced transit disruptions as the last protesters remained holed up on a university campus. (AP Photo/Kin Cheung)
Workers start to clean up the road outside the Hong Kong Polytechnic University in Hong Kong on Wednesday, Nov. 20, 2019. Hong Kong schools have reopened after a six-day shutdown but students were facing transit disruptions as the last protesters remained holed up on a university campus. (AP Photo/Ng Han Guan)
Medical workers escort a protester from Hong Kong Polytechnic University in Hong Kong, Wednesday, Nov. 20, 2019. A small band of anti-government protesters, their numbers diminished by surrenders and failed escape attempts, remained holed up at a Hong Kong university early Wednesday as they braced for the endgame in a police siege of the campus. (AP Photo/Vincent Yu)