Two ISIS sympathizers dead after they open fire at Mohammed cartoon event in Texas.

Two ISIS sympathizers dead after they open fire at Mohammed cartoon event in Texas. (CNN). (RT).

A video depicting the start of the events can be found HERE.

Two men who opened fire outside a contest for Prophet Mohammed cartoons in a Dallas suburb were shot dead by police Sunday night, authorities said.

The men drove up to the Culwell Event Center in North Garland, got out of their car and began shooting just as the "Muhammad Art Exhibit and Cartoon Contest" inside was coming to an end, Garland police spokesman Joe Harn said.

An unarmed security guard was shot in the leg. He was later treated and released from a hospital.

Police who were helping with security at the event fired back, killing both gunmen.

"The first suspect was shot immediately," Garland Mayor Douglas Athas told CNN. "The second suspect was wounded and reached for his backpack. He was shot again."

The gunmen's identities weren't immediately released.

"We have no other indication that anyone else was involved," Athas said.

FBI and local officials were checking on the gunmen's vehicle for explosives and the area around the center was blocked off.

Surrounding businesses, including a Walmart, were evacuated, as were attendees from the Curtis Culwell Center.

There is no immediate threat to the area, police said late Sunday night.

Both attackers were killed in the shooting, but police proceeded to search the area for a vehicle that could allegedly have explosives in it.

“Because of the situation and what was going on today and the history of what we've been told has happened at other events like this, we're considering their car as possibly having a bomb,” said Garland police officer Joe Harn, describing the search as a “precaution.”

According to tweets from IS followers, the attack was carried out by jihadi militants loyal to the terrorist group.

An IS fighter from the UK tweeted - "2 of our brothers just opened fire at the Prophet Muhammad (s.a.w.) art exhibition in texas" and "They Thought They Was Safe In Texas From The Soldiers of The Islamic State," according to SITE Intelligence, an online watchdog of jihadist activities.

One of the gunmen is believed to have tweeted about the impending attack earlier on Sunday, saying 'May Allah accept us as mujahideen.'

One of the organizers, Pamela Geller, was “known to make anti-Muslim statements,” and is notorious for arguing in courts the idea of placing anti-Muslim ads around New York, Al Jazeera reports.

In her tweets after the shooting, Geller said that what has occurred in Texas was “a war on free speech.”

The American Freedom Defence Initiative was allowed by a federal court to display its ad campaign on New York’s Metropolitan Transportation Authority buses. Some online comments have suggested that the shooting might be linked to this particular ad campaign. Similar campaigns have also taken place in Washington DC.

#BREAKING Overhearing Officer. "This was a direct attack, they (suspects) were ready to go." @wfaachannel8

— Jobin Panicker (@jobinpnews) May 4, 2015

Picture taken just before #garlandshooting . Thank God the heroes of SWAT-team prevented the worst. pic.twitter.com/BBaQNJir9b

— Geert Wilders (@geertwilderspvv) May 4, 2015

PHOTO.... Bodies on road outside TX free speech event @PamelaGeller @jihadwatchRS pic.twitter.com/JYUmIyHU7p

— Jim Hoft (@gatewaypundit) May 4, 2015