Japanese police today mounted a massive manhunt for the masked bandit who pumped four bullets into the nation's top cop in broad daylight in eastern Tokyo. Media outlets, meanwhile, fielded telephoned threats of new attacks on police if they continue to investigate thecult Aum Shinrikyo, which is suspected of masterminding last week's nerve gas attack thatkilled 10 Tokyo subway passengers. Although the cult denies involvement with the gassing, or with the shooting of National Police Agency chief Takaji Kunimatsu, police have seized a cache of hazardous chemicals during raids on the sect's compounds. Kunimatsu was in serious condition after surgery requiring 21 pints of blood. The gunman wore a surgical mask and fled by bicycle. Police are trying to track down the cult's leader, Shoko Asahara, whose whereabouts have been unknown since the gas attack.