by FOX NEWS Reporter Molly Henneberg

ANKARA, Turkey - One person is dead after an attack on the American Embassy in Turkey. There are still many questions about the suicide bombing at the U.S. Embassy in Ankara, the capitol of Turkey. There is one thing the White House says they know for sure.

"A suicide bombing on the perimeter of an embassy is by definition an act of terror," says White House Press Secretary Jay Carney. "It is a terrorist attack."

The attack taking place inside the security checkpoint at the side entrance of the embassy, one guard killed, 2 others injured. The White House and State Department say they are working with Turkish officials to get to the bottom of the attack.

"The level of security protection at the office embassy in Ankara ensured that there were not significantly more deaths than could have been," says the State Department's Victoria Nuland.

The Turkish Prime Minister says the attacker belonged to a Marxist Extremist group designated a terrorist organization by the U.S. and European Union.

"We will work closely and are working closely with Turkish authorities to investigate the incident and bring the perpetrators to justice," says Carney.

One expert says the group Turkish officials are blaming for the attack is a small, but very anti-American fringe organization, which considers the U.S. an imperial power and does not like any American presence in the region.

"It makes sense that we have sent troops over to Turkey to deploy NATO patriot missiles to defend Turkey against Syria, you know?" says Turkish Research Program Director Soner Cagaptay. "They see that kind of U.S. presence in Turkey as something that always goes against their fundamentalist ideological thinking, and I think as a result of that, the group has been called into action."

The U.S. warned Americans to stay away from all U.S. diplomatic facilities in Turkey and to be wary in large crowds.
Suicide bomber kills guard at US Embassy in Turkey