The shooting outside a Muhammad cartoon contest in Garland, Texas Sunday, that AP reports left one security guard shot and two suspects dead, was not only celebrated online by "Abu Hussain Al Britani" but appears to have been anticipated by him. A man he followed, "Shariah is Light," posted a statement that has some suspecting he might have been one of the attackers.

Here was the post from "Shariah is Light" Sunday afternoon prior to the attack: 

The Twitter account for Al Britani, who followed "Shariah is Light," was suspended late Sunday night.

Here are screenshots from SooperMexican, who caught the tweets from Al Britani before the account was suspended: