A Hong Kong student who sustained head injuries when he fell during clashes with police died on Friday, triggering a fresh wave of outrage from the pro-democracy movement and fears of more violent unrest.
Although the precise chain of events leading to 22-year-old Alex Chow's fall are unclear and disputed, his death is the first student fatality during five months of demonstrations.
Protesters, who allege police tactics contributed to Chow dying, responded to his death with calls for Friday night vigils across the city as well as further rallies over the weekend.
"Today we mourn the loss of a freedom fighter in Hong Kong," Joshua Wong, a prominent pro-democracy campaigner, said on Twitter.
"We will not leave anyone behind - what we start together, we finish together. Given the losses suffered by Hong Kong society in the past month, the government must pay the price."
Online forums used by the largely anonymous and leaderless protest movement also quickly filled up with the calls for vigils to mourn Chow's death.
Chow was taken to hospital early on Monday morning following clashes between police and protesters in the middle-class district of Tseung Kwan O.
He was certified dead by the hospital on Friday morning after failing to emerge from a coma.
He had been found lying unconscious in a pool of blood inside a multi-storey car park that police had fired tear gas towards.
Protesters had been hurling objects from the building, in the type of confrontation that has become routine in late-night rallies over recent months.
Police acknowledged that tear gas had been used to disperse protesters near the car park where Chow fell on Sunday night.
But they denied any wrongdoing, saying their use of tear gas was justified and rejecting other allegations of hindering Chow's rescue.
"The police did not hinder any fire services officers, ambulance responders or ambulance at all from taking the injured to leave the scene," a police spokeswoman said this week.
In a short statement, the Hong Kong government expressed "great sorrow and regret" on Friday over Chow's death.
It did not comment on the specific circumstances that led to him dying, other than to say police were investigating.
In Beijing, foreign affairs ministry Geng Shuang declined to comment directly when asked about Chow's death.
"This isn't a diplomatic question so I suggest you ask the relevant government department. I will just say this: stopping the violence, eliminating disorder, and restoring order is Hong Kong's most urgent task," Geng told reporters.
Chow was a student at Hong Kong University of Science and Technology.
The college held its graduation ceremony Friday morning, and university head Wei Shyy paused the proceedings to announce Chow's death.
After the ceremony was cut short, hundreds of students gathered to mourn Chow's passing and condemn what they described as police brutality.
"Hindering rescuers is attempted murder!" Student chanted as they marched in the campus.
Millions of people have taken to Hong Kong's streets since June in the greatest challenge to China's rule of the city since its handover from the British in 1997.
China governs Hong Kong under a special "one country, two systems" framework that is meant to give the city more freedoms and liberties than on the mainland.
But public anger has been building for years over a belief that Beijing is eroding those freedoms, especially since President Xi Jinping came to power.
The protests were triggered by a government effort to introduce a law allowing extraditions of criminal suspects to mainland China.
Hong Kong's government belatedly withdrew the plans but not before the protest movement escalated into wider calls for democracy.
Protesters are demanding fully free elections to choose the city's leader, as well as an investigation into alleged abuses by police.
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