Police are searching for an angler who went missing at a lake in Hokkaido, suspecting he may have been attacked by a bear after a human head was found in the area Monday, they said. According to the police, a boat dropped off Toshihiro Nishikawa, 54, to fish unaccompanied at a spot on Lake Shumarinai in Horokanai early Sunday. An employee of the boat operator later saw a bear nearby with waders dangling from its mouth and attempted to call Nishikawa by phone, but could not reach him. The information prompted the town office to launch a bear hunt operation and a member of the group killed one Monday afternoon, according to a town official.