Two gunmen opened fire on Sunday at an art exhibit in Garland, Texas, that was organized by an anti-Islamic group and featured caricatures of the Prophet Mohammad and were themselves shot dead at the scene by police officers, city officials and police said.

The shooting, an echo of past attacks or threats in other Western countries against art depicting the Prophet, took place shortly before 7 p.m. in a parking lot of the Curtis Culwell Center in Garland, northeast of Dallas.

Police said they had not immediately determined the identity of the two gunmen or whether they were linked to critics of the event who branded it anti-Islamic.

"I have no idea who they are, other than they're dead and in the street," city police spokesman, officer Joe Harn, told Reuters.

As a precaution, police were examining the suspects' car for any explosives that might be in the vehicle, Harn added.

The exhibit in Garland was organized by Pamela Geller, president of the American Freedom Defense Initiative (AFDI). Her organization, which is described by the Southern Poverty Law Center as a hate group, has sponsored anti-Islamic advertising campaigns in transit systems across the country.

The two armed suspects drove up to the front of the building in a car as the event was coming to an end, and began shooting at a security officer, striking him in the leg, Harn said.

Garland police officers who were on the scene assisting with security then exchanged fire with the gunmen, and both suspects were shot dead, Harn said.

The security officer was treated at a local hospital and later released, he said. No one else was injured.

Most of the people attending the event were still inside the arena when the violence unfolded and were unaware of what had occurred until police came into the building and advised everyone to remain indoors because of a shooting.

Western art depicting the Prophet has angered Muslims and provoked threats from radicals. In January, Islamist gunmen attacked the Paris offices of the French satirical magazine Charlie Hebdo in revenge for its cartoons of the Prophet, killing 12 people. – Reuters