http://www.latimes.com/nation/la-na-texas-shooting-20150503-story.html
(excerpt)
The shooting in Garland, a Texas suburb about 20 miles from Dallas, was preceded by messages from two social media accounts that supported extremist Islamic viewpoints.
BREAKING>>> Islamic State Partisans Take Responsibility for TX Terrorist Attack BEFORE ATTACK!
Posted by Kristinn Taylor on Sunday, May 3, 2015, 8:59 PM