Police are investigating an incident in which a shotgun went off at the Mong Kok police station.
The Remington Model 870 fired after it was loaded by a female emergency unit officer in the armory, news website hk01.com reports.
The bullet pierced the wall but no one was hurt.
The officer, a three-year veteran of the force, had completed her shotgun training a week earlier, according to Sing Tao Daily.
The incident, believed to have been caused by human error or malfunction, nonetheless raised concern about police training and firearms safekeeping.
It was the fourth such incident since July.
An officer from the anti-terrorism unit misfired his Glock-17 pistol while unloading it at police headquarters in Wan Chai on July 2.
On Sept. 7, a female officer accidentally discharged her gun during training in Tai Po.
No one was hurt in both incidents.
Another woman police officer accidentally fired her revolver in a Sha Tin police station on Sept. 14, wounding her right leg.
Lai Wing-kuen, chairman of Hong Kong Shooters Confederation, said the fact that the four incidents involved different types of guns suggested they were more likely caused by negligence rather than mechanical problems.
He urged the police to conduct a thorough review to make sure all officers follow proper firearms procedures.
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