A knife-wielding maniac stabbed a woman on a bus in downtown Los Angeles Saturday morning before fleeing the scene in a shocking daylight attack, police said. The stabbing occurred around 6:55 a.m. aboard an LA Metro bus near Olympic Boulevard and Grand Avenue, the LAPD said. The unidentified victim, who was seen walking to paramedics on the scene, was taken by paramedics to the hospital after the attack. The suspect — who remained on the loose as of late Saturday morning — was described as a