HONG KONG (AP) — Following a day of sit-ins, tear gas and clashes with police, Hong Kong students and civil rights activists vowed Wednesday to keep protesting a proposed extradition bill that has become a lightning rod for concerns over greater Chinese control and erosion of civil liberties in the former British colony.

The violence marked a major escalation of the biggest political crisis in years for the semi-autonomous Chinese territory and forced the delay of legislative debate on the contentious bill.

College student Louis Wong said he considered the blockade of government headquarters and the Legislative Council a success because it appeared to prevent Beijing loyalists from advancing amendments to a pair of laws that would make it easier to send suspected criminals to China.

"This is a public space and the police have no right to block us from staying here," Wong said, surveying a garbage-strewn intersection in the Admiralty neighborhood that had been blocked off by security forces after protesters broke through a police cordon and entered the government complex.

"We'll stay until the government drops this law and (Chinese President) Xi Jinping gives up on trying to turn Hong Kong into just another city in China like Beijing and Shanghai," he said.

Protesters who had massed outside the government building overnight Tuesday began pressing against the police early Wednesday, leading to police firing tear gas and pepper spray.

The overwhelmingly young crowd overflowed onto a major downtown road as they overturned barriers and tussled with police. When some appeared to have breached a cordon around the building, the police launched their response.

A weekend protest of the extradition measure drew hundreds of thousands of people, and Hong Kong leader Carrie Lam said in a statement early Thursday that the peaceful rally had become a "blatant, organized riot."

At a brief news conference held as the chaos swirled outside on Wednesday afternoon, Police Commissioner Stephen Lo Wai-chung said the "serious clashes" forced police to use pepper spray, bean bag rounds, rubber bullets, and tear gas.

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Officers also were hurt, some seriously, by rocks, bottles, traffic cones, metal barricades and other items thrown by protesters. Police spokesman Gong Weng Chun defended the use of tear gas and other nonlethal weapons, saying officers wouldn't have had to do so if they weren't facing a threat that could lead to serious injury or death.

As of 10 p.m. Wednesday, at least 72 people were brought to seven hospitals, with two in serious condition, the Hong Kong Hospital Authority said. Of those, 41 were later released, it added.

Lo also called the demonstration a riot, which could mean long jail terms for anyone arrested, adding to fears that Hong Kong's government is using public disturbance laws to intimidate protesters.

"We condemn such irresponsible behavior," Lo said. "There's no need to hurt innocent people to express your opinions," he said, adding that people should not "do anything they will regret for the rest of their lives."

A curt government statement said a scheduled 11 a.m. legislative session would be "changed to a later time." Officials gave no indication of when that would be, and Lam canceled a news briefing.

Some businesses also closed for the day, and labor strikes and class boycotts were called.

The protests by the bill's opponents are the largest since pro-democracy demonstrations closed down parts of the Asian financial center for more than three months in 2014.

The demonstrations pose a challenge to Xi, who has said he would not tolerate Hong Kong being used as a base to question the ruling Communist Party's authority. But they are also giving a voice to the young in the territory who feel alienated by a political process dominated by the economic elite.

The legislative process for the bill remained unclear following the violence, which largely ended by about 5 p.m. after police herded demonstrators across a pedestrian bridge. Traffic in one of the busiest parts of the city remained blocked, however, and several hundred protesters seemed in no hurry to leave.

The protesters said they hoped the blockade would lead to the measure being shelved.

"We want the government to just set the legislation aside and not bring it back," said a protester who gave only his first name, Marco, because he feared possible repercussions from authorities.

Another protester, who gave her name only as King, also fearing repercussions, said the protest was a watershed moment for Hong Kong's youth. "We have to stand up for our rights or they will be taken away," she said.

Dressed in black T-shirts and jeans, many protesters appeared undaunted by police demands to disperse. The demonstrators also appeared mindful of Beijing's growing use of electronic surveillance such as facial recognition technology to build dossiers on those it considers politically unreliable, and many of them wore surgical masks to hide their features as well as reduce the effects of tear gas.

Such protests are never tolerated in mainland China, and Hong Kong residents can face travel bans and other repercussions if they cross the border.

In an interview with Hong Kong broadcaster TVB, Lam denied she was "selling out" Hong Kong with the extradition bill but conceded the measure would continue to attract criticism.

"It's time to let lawmakers with different opinions express their views under the legislative process," she said. "On whether to retract or push it through ... our consideration is this: There is no doubt this issue is controversial. Explanation and dialogue are useful but perhaps that has not entirely dispelled worries."

Speaking of her commitment to her job, her voice broke as she said: "They said I'm selling out Hong Kong. How could I do that? I grew up here with everyone else in the city."

Lam added that she has never "felt guilty" over the issue and believed she was doing the right thing. She said she felt "worried and sad" about the young protesters, but said that as a parent of two sons, she believed it would be wrong to cave in to "willful behavior."

Under its "one country, two systems" framework, Hong Kong was supposed to be guaranteed the right to retain its own social, legal and political systems for 50 years following its handover from British rule in 1997. However, China's Communist Party has been seen as increasingly reneging on that agreement by forcing through unpopular laws.

A vote on the legislation is scheduled on June 20.

China's Foreign Ministry repeated its support for the bill, with spokesman Geng Shuang denying Beijing has been interfering in the city's affairs in a way that violates agreements made when Hong Kong was handed back to China.

"Hong Kong people's rights and freedoms have been fully guaranteed in accordance with law," he said.

At the White House, U.S. President Donald Trump called it as "big a demonstration as I've ever seen," adding: "I hope it all works out for China and for Hong Kong."

In a statement, Australia's Foreign Ministry called for both sides to show restraint and said it had raised concerns about the proposed amendments at senior levels within the Hong Kong government.

The protests are widely seen as reflecting growing apprehension about relations with the mainland, where Xi has said he has zero tolerance for those demanding greater self-rule for Hong Kong.

Critics believe the extradition legislation would put Hong Kong residents at risk of becoming trapped in China's judicial system, in which opponents of Communist Party rule have been charged with economic crimes or ill-defined national security offenses, and would not be guaranteed free trials.

Lam said the government has considered concerns from the private sector and altered the bill to improve human rights safeguards. She said without the changes, Hong Kong risked becoming a haven for fugitives. She emphasized that extradition cases would be decided by Hong Kong courts.

Opponents say the changes would significantly compromise Hong Kong's legal independence, long viewed as one of the crucial differences between the territory and the mainland.

Hong Kong now limits extradition to jurisdictions with which it has existing agreements and to others on an individual basis. China has been excluded from those agreements because of concerns over its judicial independence and human rights record.

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Associated Press writers Raf Wober and Alice Fung in Hong Kong, Johnson Lai in Taipei, Taiwan, Kevin Freking in Washington and Sally Ho in Seattle contributed.