The National Police Agency proposed Friday expanding the compensatory liability of mob bosses for damages their underlings cause and squeezing yakuza-linked construction firms out of the bidding process for public works projects, NPA officials said.

The yakuza crackdown comes on the heels of crimes stemming from battles among underworld groups facing financial difficulties, including the April assassination of Nagasaki Mayor Itcho Ito by a mobster.

National Public Safety Commission Chairman Shinya Izumi, a Cabinet minister supervising the police, presented the proposals at a ministerial meeting on crime prevention Friday morning.