Police were quoted by the South China Morning Post that they found two kilos of powerful explosives, ten petrol bombs, and acidic substances. T-shirts with messages in favour of Hong Kong independence and leaflets with anti-extradition messages were also found.

Speaking to media, Chief Superintendent of Police Public Relations Branch Tse Chun-Chung confirmed that one person had been arrested, and police had not yet determined a clear motive. "The operation is still ongoing, and we may arrest more people in the coming future", Tse added.