According to several news reports, the police said the gunman shot and killed himself and may be among the count of 12 or 13 dead. killed also.
The gunman has been identified as 42 year old Jiverly Voong. Nothing shows up about him on Google. VP Biden said people they were taking a test for their citizenship and said we have to find a way to stop this type of violence. A better form of gun control might help.
Watching cable news cover these types of stories is very tough. As soon as some crisis breaks, they fill their airwaves with endless speculation and unsubstantiated facts that usually are proven wrong. I could speculate too, but it's kind of premature. The fact that it happened in an immigration services center will fuel wild speculation as well.