The man who plowed a car into a crowd at Ohio State University before stabbing several pedestrians with a butcher knife praised American-born Al Qaeda cleric Anwar al-Awlaki as a hero and also rallied against U.S. interference in Muslim lands, law enforcement officials said.

“America! Stop interfering with other countries, especially the Muslim Ummah. We are not weak. We are not weak, remember that,” Abdul Razak Ali Artan reportedly wrote on Facebook, using the Arabic term for the world’s Muslim community.

The posts from Artan’s account came to light after Monday’s violence, which left 11 people injured.

“Every single Muslim who disapproves of my actions is a sleeper cell, waiting for a signal. I am warning you Oh America!” Artan also said.

The posts were recounted by a law enforcement official who was briefed on the investigation but wasn’t authorized to discuss it publicly and spoke on condition of anonymity.

Other sources told Fox News on Tuesday that the reference of al-Awlaki on Abdul Razak Ali Artans social media accounts is deeply concerning because it could suggest he was self-radicalized before launching the attack.

The FBI is now in possession of Artans electronic devices and will focus their investigation on whether he was reading the two recent ISIS propaganda journals that called for attacks using vehicles and knives, a law enforcement source added.

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