Ex-Marine 'ambushed' 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 at the weekend specifically targeted the cops, officials said Monday. Louisiana investigators were now trying to determine why the shooter -- identified by US media as Gavin Long, 29 -- opened fire on the officers on Sunday. It was not yet clear if his act had a similar motivation as the slaying of five Dallas officers 10 days ago, when a black veteran of the Afghanistan war op