Hong Kong police raid powerful pipe bomb lab in a residential building on Tuesday.
Police destroyed the laboratory where rioters made explosives.
When a homemade bomb was detonated at the scene, the shrapnel punched a hole in one of the lifts.
Police arrested four core members believed to be from underground violent groups. Three of them are college students.
Rioters throw petrol bombs at the police in Causeway Bay, China’s Hong Kong, on Aug. 31, 2019. Photo:Xinhua
