TOKYO, April 21 (Reuters) - Police on Saturday stormed an apartment in a Tokyo suburb and took into custody a gangster who shot and killed a fellow mobster and then holed up days after the fatal shooting of the mayor of Japan's Nagasaki City.

No hostages had been taken in the incident, which ended after 15 hours during which police in riot gear had stationed themselves outside the apartment while a senior gang member urged his henchman to surrender, media reports said.

Japan has strict gun control laws and legal firearms are mostly in the hands of hunters and police, but the shooting of the Nagasaki mayor by a gangster on Tuesday has prompted lawmakers, including Prime Minister Shinzo Abe, to call for even tighter supervision.

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