9 arrested in plot to bomb 2 city districts

Hong Kong authorities haven't ruled out further arrests after police said on Monday that they busted nine radical activists who were allegedly preparing to bomb sites around the city's center of government.

Samples of the explosive triacetone triperoxide and at least 11 kg of related substances were seized by officers of the Organized Crime and Triad Bureau in a series of Monday-morning raids, beginning at a derelict television studio that police say was used as a location for making bombs.

Nine Hong Kong residents - four women and five men aged 21 to 34 - have been arrested on charges of conspiracy to manufacture explosives. The police also seized formulas for making explosives and smoke grenades.