Update 10:22 a.m. Monday: Police in Garland say two men had opened fire with assault rifles on officers outside a venue hosting a provocative contest for cartoons of the Muslim prophet Muhammad.
Officer Joe Harn said Monday the men, killed by security officers, also had more ammunition. He said investigators searched their vehicle and detonated several suspicious items, but no bombs were found in the vehicle.
He said luggage was found in vehicle but he wasn't sure what specifically was found amid the luggage.
Harn said the officer shot in the lower leg was the only officer hurt.
He said a security plan for the event had been developed over several months.
Update 9:45 a.m. Monday: The FBI says agents are searching a Phoenix apartment as part of the investigation into the deadly shooting outside a Garland venue hosting a provocative contest for Muhammad cartoons.
FBI spokesman Perryn Collier on Monday confirmed the Phoenix residence is being searched for indications of what prompted the shooting Sunday that left two gunmen dead and a security officer wounded outside a center in Garland.
ABC News cites a senior FBI official in reporting that one of the gunmen, a resident of the Phoenix apartment, was known to authorities and was the subject of an investigation. The ABC report says the man was convicted five years ago of lying to federal agents about plans to travel to Africa, in an apparent attempt to join a terror group there.
Original story: Two gunmen were killed Sunday night in Garland after opening fire on a security guard outside a Muhammad cartoon contest.
The city of Garland said in a statement posted on its Facebook page Sunday night that two men drove up to the Curtis Culwell Center and began shooting at a security officer. The statement says Garland Police Department officers engaged the gunmen, who were both shot and killed.
The statement doesn't say whether the shooting was related to the event.
The statement says the gunmen's vehicle may contain an "incendiary device." A bomb squad is on scene.
Nearby businesses were evacuated.
The American Freedom Defense Initiative was hosting a contest that would award $10,000 for the best cartoon depicting Muhammad.
The event had been on lockdown and attendees were being evacuated after authorities reported a shooting outside the building.
An officer dressed in SWAT gear took the stage toward the end of the event at the Curtis Culwell Center and told attendees, including an Associated Press reporter, that a shooting had occurred. Garland Police Department spokesman Joe Harn has declined to confirm the SWAT officer's statements and says he has no details.
About 75 attendees were taken to another room. Later, a group of 48 people were escorted to a school bus. Authorities told attendees they would be taken to a nearby high school. A second group was set to be moved shortly after.
The New York-based American Freedom Defense Initiative was hosting a contest that would award $10,000 for the best cartoon depicting Muhammad at the venue.
The Dallas Morning News reports:
Authorities extended a perimeter 2,000 feet around the Culwell Center, and they were investigating a car within that zone. Garland police were waiting for a bomb squad to examine the vehicle. Reports of the incident began to develop shortly before 7 p.m., when the event had been scheduled to conclude. A speaker had finished his presentation shortly after 6:30 p.m. Throughout the event, there had been no notable protests, despite its controversial nature.