Spontaneous protests broke out at several locations in Hong Kong Friday afternoon after the death in hospital of a student.

Chow Tsz-lok, also known as Alex Chow, 22, was found with serious head injuries five days ago, in a car park near the scene of a street battle between police and anti-government demonstrators, and had been in a coma since.

Police earlier told reporters that Chow fell from the third to the second story of the car park. Officers were in the car park at the time, but the police deny that Chow was pushed or that they were pursuing him.

Although the circumstances remain unclear, the computer science undergraduate is nonetheless being regarded by protesters as having died as a result of injuries sustained during a demonstration—potentially the first such case in five months of increasingly violent unrest.

Within hours of his death on Friday morning, crowds of office workers began gathering in the financial district, occupying main thoroughfares and chanting “Hongkongers, take revenge!” Calls for protesters to take “blood for blood” circulated online.

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Hong Kong Student Dies After Falling During a Protest