Beijing police have seized more than 400 guns and 870,000 rounds of ammunition, including simulated bullets, since May as part of the Municipal Police Bureau's effort to fight terrorism and create a safe environment in the capital city.

More than 150 people have been detained for possessing these controlled items, the bureau said on Thursday in a statement.

The police department also said it seized more than 220,000 contraband items at security checks at subway stations and other transport hubs last year.

The bureau organized six rounds of anti-terrorism drills and provided professional training to more than 2,500 personnel over the past year. It also said technology investments and the number of air patrols were significantly increased during the period.