Angry protesters forced a group of police to retreat behind the walls of a police station in Wong Tai Sin.

The protesters, who vastly outnumbered the police, were throwing projectiles like water bottles and rocks at the officers. Some of them vandalized the outside walls of the station with graffiti.

Police fired tear gas after futile attempts to disperse a crowd of protesters, they said in a statement.

"Police also appeal to the residents in the area to stay tuned to the latest situation and if necessary, stay indoors and keep their windows closed," the statement added.

Watch the scene here: