Suzette Foo, a senior superintendent of the Hong Kong Police Force, said earlier this week that police officers had fired 44 rounds of tear gas, 11 rubber bullets, three beanbag rounds and one sponge grenade during operations in the Tseung Kwan O district near where Mr. Chow fell.
“The sole purpose was to disperse those protesters who had assembled, thrown hard objects and attacked the police in that area,” she said.
Video from i-Cable News, a Hong Kong broadcaster, showed the police firing rounds of tear gas up into an elevated parking garage from which protesters had thrown traffic cones down.
Ms. Foo said the point where the student fell was about 130 yards from where police officers fired tear gas that night. She did not deny the possibility that tear gas could have contributed to the incident, but said there was only a small amount in the air when rescuers responded.
She also denied that the police had interfered with emergency responders who were treating Mr. Chow or had barred an ambulance from reaching him.
An emergency responder, who spoke on condition of anonymity because of the sensitivity of the incident, said officers tried to make rescuers leave as they were treating the injured student. They also blocked an ambulance from approaching, the emergency responder said. Video of the scene showed that another ambulance eventually took Mr. Chow to a hospital.
The Fire Services Department said however that one of its ambulances was blocked by private traffic, not the police, and firefighters aiding Mr. Chow did not notice any police officers asking them to leave, the Hong Kong public broadcaster RTHK reported.