(AP Photo/Brandon Wade)
(AP Photo/Brandon Wade)

While ISIS has claimed responsibility for Sunday's attack in Texas, some counterterrorism experts have raised doubts about whether ISIS was behind it.

FOX News Radio's Tonya J. Powers has more:

House Homeland Security Chair Michael McCaul of Texas says a Twitter account linked to Elton Simpson included images of a radical cleric and the hashtag #texasattack, but says evidence doesn't show ISIS directed the attack, but may have inspired it.

A federal law enforcement official told the Associated Press that authorities had an open investigation on Simpson at the time of the shooting.

And in Pakistan, a service to remember the gunmen.

(Funeral attendee) "They went over there and they tried to stop that event, because it was a blasphemous event. So they tried to stop it because it is going to promote that racial hatred."

Any depiction of the prophet Muhammad is considered blasphemy in the Islamic religion.

Tonya J. Powers, FOX News Radio. 

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