Seven men wanted by police in connection with the fatal beating of a 31-year-old restaurateur in September 2012 at a Roppongi nightclub turned themselves in Friday morning and several were later arrested, police said.
The move follows Thursday's arrest of eight men, including Taichi Ishimoto, 31, former leader of the now-defunct motorcycle gang Kanto Rengo who is currently on trial for fraud, and other ex-members.
Two others, a 33-year-old former Kanto Rengo member who is considered the ringleader and another man, have fled overseas.