Hong Kong police have arrested a 13-year-old boy and seized three suspected smoke grenades after firefighters were called to a flat in Kwai Chung.
Police received a call at 10.38pm on Thursday that smoke could be seen coming from the flat at The Apex private housing estate on 33 Wo Yi Hop Road.
Officers at the scene seized three suspected smoke grenades from the teenager, who was arrested on suspicion of possessing explosives.
The incident forced about 300 residents to evacuate the building. Firefighters later put out the smoke.
Police said no injuries were reported.
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