A gangster who turned himself in to Tokyo police last week was arrested Saturday in connection with four recent shooting deaths at a bar in Maebashi, Gunma Prefecture.

The man was identified as Haruo Doi, 43, a senior member of a gangster group affiliated with the Sumiyoshi-kai, one of the largest crime syndicates in Japan.

Doi turned himself in to the Metropolitan Police Department on Jan. 29, saying he fired shots in the bar on the night of Jan. 25. A former gangster and three people with no apparent links to the underworld were killed in the attack.

Doi did not hand over a weapon to local police in Maebashi, but he directed them to a stretch of a river where they found two automatic weapons and a dark jumper.