Last I heard this morning, they're asking the shooter to turn himself in. The targets are certainly USMC related and the concern is the USMC marathon this weekend expecting 30k runners ... geesh, nothing like giving this nutjob an idea .... 
Yeah, somebody doesn't like the USMC, or the U.S. military in general. This is like the 4th type of attack on U.S. military sites now, right? I think they should hang the traitor when they find him/her/them.