UPDATE:excerpt:Motive mystery in BR shootingsPolice remained stumped late Friday as to why a woman shot and killed two other female students and then herself at Louisiana Technical College."We still are no closer to learning a motive," Sgt. Don Kelly, a Baton Rouge Police Department spokesman, said Friday afternoon. "We've interviewed several witnesses ... and are unable to determine why this happened."The shootings began around 8:30 a.m. when 23-year-old Latina Williams walked into a second-story classroom on the college's campus at 3250 N. Acadian Thruway East, Kelly said.Williams spoke with a teacher and left the classroom, only to return moments later through a back door.Williams then emptied a six-shot .357-caliber revolver into Karsheika Graves, 21, and Taneshia Butler, 26, Kelly said. Williams reloaded the weapon and shot herself in the head.About 20 people were in the classroom, Kelly said.read...