Gunman at Texas Mohammed cartoon event was target of terror investigation
Police officers direct the evacuation of attendees of the Muhammad Art Exhibit and Contest sponsored by the American Freedom Defense Initiative after a shooting outside the Curtis Culwell Center where the event was held in Garland, Texas May 3, 2015. REUTERS/Mike Stone

Citing a senior FBI official, ABC News on Monday identified one of the gunmen at Sunday's attack at an exhibit of caricatures of the Prophet Mohammad in a Dallas suburb as Elton Simpson, an Arizona man previously the target of a terror investigation.

FBI agents and a bomb squad were searching Simpson's Phoenix home overnight, ABC said. Garland, Texas police and the Federal Bureau of Investigation had no immediate comment on the report.