The White House said Wednesday that the shooting in Texas for which the Islamic State has claimed responsibility was consistent with a lone-wolf attack, while a terrorism watch group said the violence may have been inspired by an al-Shabab extremist from Minnesota who is wanted by the FBI.

The Counter Extremism Project, which is headed by former Homeland Security adviser Frances Townsend, said extremist Mohamed Abdullahi Hassan called on his “brothers” to attack the “Draw the Prophet” contest in Texas and compared it with the killings in France this year at the satirical magazine Charlie Hebdo.