ISIS Tweets on Chattanooga Terror Attack

[This blog post was originally titled: "BREAKING: ISIS Tweets Warning Simultaneous With Start of Chattanooga Terror Attack". See below for why I changed it.]

It is still not clear whether the "warning" was issued before the attack, or a few minutes after it began.

It was recently confirmed that 4 U.S. Marines were killed.

Update (3:13 PM CST): Two law enforcement sources told CBS News that the shooting suspect was identified as Muhammad Youssef Abdulazeez.

He was born in Kuwaiti but was possibly a naturalized American citizen. It appears he was 24 years old and according to News9 may have graduated from the University of Tennessee with an Electrical Engineering Degree.

Update (4:24 PM CST): There is now controversy as to whether the time stamp on the tweet was in fact Pacific Time, which would indicate it was sent three hours after the start of the attack.

Update (12:09 PM CST, July 17): That the time stamp was Pacific Time, and therefore that the tweet was sent out two or three hours after the attack had been made public, has now been confirmed.