The discovery comes on the eve of a series of high-profile protests planned over the weekend, amid high tensions in the semi-autonomous Chinese city over a now-suspended extradition bill.
At a press conference Saturday, police confirmed the arrest of 27-year-old man in connection with the raid at what officers called a homemade laboratory in the industrial area of Tsuen Wan.
“It’s the largest such seizure we have ever come across in Hong Kong,” said Alick Mcwhirter, superintendent of the Explosive Ordinance Disposal (EOD) Bureau. Leaflets linked to anti-extradition bill protests were also found on site.
Police uncovered 2 kilograms (4.4 pounds) of high explosives, 10 petrol bombs, corrosive liquids, weapons and metal poles at the property.