A JAPANESE BALLOONIST'S attempt to become the first man to cross the Pacific alone in a helium-filled craft ended in failure just hours after liftoff Friday, a project spokesman said. Japanese coast guard officials found adventurer Fumio Niwa floating in the ocean about 260 miles southeast of Tokyo . . . A DETROIT-AREA MINISTER was arrested Wednesday and charged Thursday with robbing two banks and has admitted robbing 12 others, prosecutors said . . . KIDNAPPERS FREED a rich Sardinian landowner early Friday after holding him captive for 82 days in the barren mountains of central Sardinia, police said.