Another person in Hong Kong has died in protests that have convulsed the financial hub since June, a fatality that comes just after China’s leader issued his most direct rebuke of the unrest yet.

A 70-year-old cleaner who was believed to have been hit in the head during a skirmish between protesters and residents died Thursday evening, the Hospital Authority confirmed. According to a government statement, the man was on his lunch break when he was struck by “hard objects hurled by masked rioters.”

At a press conference Friday, Senior Superintendent of Crime Chan Tin-chu encouraged any witnesses to come forward. After reviewing video footage of the incident in Sheung Shui, a suburb near the Chinese border, he said police believe the attack was “malicious” and are investigating it as a murder.

“Bricks were deliberately hurled towards him and he died later on,” Chan said.

The man’s death follows less than a week after a student protester sustained a fatal injury after falling from a parking garage during demonstrations. While the circumstances leading to the student’s fall remain unclear, many supporters of the protest movement see him as a martyr, and his death galvanized a fresh round of strikes and protests that have roiled the city for five consecutive days.

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