A suicide bomber detonated an explosive device on the outside perimeter of the U.S. Embassy in the Turkish capital Friday, officials said, killing himself and an embassy guard in a terrorist attack whose motives are under investigation.

The attack was initially believed to be the work of either Al Qaeda or a proxy for Iran. Turkish media outlets, though, were reporting that authorities have identified the attacker, who reportedly was not an Islamic extremist but instead belonged to a Marxist extremist group. The U.S. State Department later said it’s too early to determine who is behind the attack.

White House Press Secretary Jay Carney, at Friday’s briefing in Washington, called the strike an “act of terror.” But he said officials “do not know at this point who is responsible or the motivations behind the attack.”

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