“I didn’t do anything and asked them to stop beating me. But they just ignored me,” he said.

The railway station was the scene of unprecedented violence on Sunday night as a marauding gang of men in white T-shirts ambushed people including demonstrators returning home from a protest march elsewhere in the city. Some 45 people were injured and 11 have since been arrested.

So’s ordeal lasted for around five minutes before he tried to flee to safety. He was chased and struck several more times as he escaped the brutality.

The violent attacks left his back severely injured with torn skin. His hands and legs were wounded and his shoulders swollen.

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He was admitted to Tuen Mun Hospital for treatment and said the injuries left him unable to sleep on his back on the first night.

“I was in pain whenever something touched my back,” he said.

So’s recovery was expected to take several weeks and he hoped police would investigate the assaults.

“There should be at least a public explanation,” he said. “It is unacceptable to see those people randomly attacking others.”

By 6pm on Tuesday, five men were still receiving treatment at Tuen Mun Hospital. Among them, one was critical, one was serious and the remaining three were stable.

Meanwhile, Hong Kong’s former security chief and veteran pro-establishment lawmaker Regina Ip Lau Suk-yee called for residents to show understanding over police handling of the violence, arguing the force had faced attacks comparable to “guerilla warfare” over the past two months.

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“The force has been worked to the point of exhaustion and manpower is strained … with so many large-scale protests and attacks since June 9,” Ip, a member of the government’s advisory panel, said on a radio programme on Tuesday.

The city’s embattled police force came under heavy fire for arriving at the scene too late to stop the attacks on anti-government protesters, journalists and passers-by at the station, as well as terrified passengers on a train.

Ip, an Executive Council member and New People’s Party lawmaker, believed many officers from Yuen Long were deployed to Hong Kong Island as protesters laid siege to Beijing’s liaison office following a march against a now-suspended extradition bill.

Lam first suspended the bill, then declared it “dead” on July 9.

“I hope Hongkongers can understand our police have done very well handling things such as public security and theft, so the overall crime rate is very low,” Ip said.

“What happened over the past month or so is not normal violence, but continued violence. It is like facing urban guerillas.”

“I am worried some people are trying to force the People’s Liberation Army to come here,” she said, though she believed the Hong Kong and central governments would try to prevent this as much as possible.

She also warned that while there were no casualties at the siege of the liaison office, there was strong political meaning to the actions, with the compound vandalised and the national emblem on the building front defaced.

Meanwhile, about 30 members of the Foreign Correspondents’ Club (FCC) Hong Kong and journalists silently protested outside the press club on Tuesday morning to condemn the violence directed at journalists when covering the protests last weekend, particularly the “sickening scenes of mob violence” in Yuen Long.

At least four local journalists were attacked by the marauding gang on Sunday. Two victims were reportedly from Apple Daily, a Chinese-language newspaper, and one each from the Stand News website and cable broadcaster Now TV.

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One female reporter was attacked during a live online report. The news outlet said her hands and right shoulder were hurt and she suffered swelling on the back of her head.

President of the press club Jodi Schneider said: “We are out here standing for press freedom and to say yes to press freedom, no to violence against journalists. We are renewing our call for independent investigation by a third party, into any harassment or violence against journalists during the protests in Hong Kong.”

In a statement, the club called on Hong Kong police and the authorities to urgently find and bring to justice those who carried out the unprecedented attack.

A joint statement issued on Monday by the Hong Kong Journalists Association, the Hong Kong Press Photographers Association and the Independent Commentators Association made an urgent appeal to local police to protect citizens and journalists.