When 30-year-old Edward Archer opened fire on a Philadelphia policeman earlier this month, he quickly offered authorities a motive: He told them he had done it for the Islamic State.
"He pledges his allegiance to the Islamic State," Capt. James Clark of the Philadelphia Police Department told reporters hours after the Jan. 7 shooting. "He follows Allah and that is the reason he was called upon to do this."
The FBI, for its part, has said it is investigating the attack as a possible act of terrorism — inspired by ISIS.