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A gunman shouting "Allah Akbar" opened fire on a bus carrying U.S. airmen in Frankfurt, Germany, killing two and wounding two others before his gun jammed and he was subdued, officials said.
An ethnic Albanian from Kosovo was taken into custody and the FBI was heading an investigation because U.S. citizens were killed and to determine whether the shooting was an act of terrorism.

President Obama made an unscheduled appearance to say, "I am saddened and I am outraged by this attack" and U.S. investigators would work with German authorities and "spare no effort" to ensure that "all of the perpetrators are brought to justice."

He added that the killings were a "stark reminder of the extraordinary sacrifices" of American servicemembers.

Sources told ABC News that the gunman boarded a shuttle bus at the Frankfurt airport. The bus was marked United States Air Force and was carrying 13 or 14 people, plus the driver.

When he opened fire, the gunman shouted "Allah Akbar," according to sources. He fired nine times, killling two and critically wounding two others before the gun jammed and he was subdued by other passengers. While being wrestled into submission, the suspect shouted either "Jihad Jihad" or "Allah Akbar," sources said.

One of the dead was the bus driver, military officials said.

The servicemembers who were attacked were members of a Security Forces team assigned to RAF Lakenheath in Great Britain. They were en route to support Overseas Contingency Operations, although their exact destination was not stated.

Rep. Patrick Meehan, R-Pa., said at a House Homeland Security Committee hearing today that the shooting looks like it could be a terrorist attack. Meehan said he was briefed by his staff, who are continuing to collect information.

Kosovo Interior Minister Bajram Rexhepi said the German police have identified the suspect as Arif Uka, a Kosovo citizen from the northern town of Mitrovica, according to the Associated Press.

"This is a devastating and a tragic event," Rexhepi said. "We are trying to find out was this something that was organized or what was the nature of the attack."

The names of the deceased are being withheld until 24 hours after notification of next of kin.

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