Ex-Marine 'assassinated' Baton Rouge cops: police

The black former Marine and Iraq war veteran who shot dead three police officers in the southern US city of Baton Rouge deliberately targeted the cops, but his motive remained unclear, officials said Monday. Louisiana investigators called for patience as they determine why the shooter -- identified as Gavin Long -- opened fire on the officers on Sunday, the day he turned 29. It was the second calculated attack on law enforcement in 10 days, after the slaying of five officers in Dallas -- attacks