U.S. President Barack Obama said he was "outraged" over the killing of two US soldiers in Frankfurt's airport Wednesday and vowed to cooperate with the German government to investigate the case.
"I am saddened and I am outraged," Obama told reporters at the White House
Obama said the administration was still trying to gather the facts behind the incident.
"We will spare no effort in learning how this outrageous act took place," he said, offering his condolences to the families of the victims.
The two soldiers died and two were wounded after a Kosovo-manallegedly opened fire on a bus in the airport, German authorities said. It was not yet clear if the attack was politically motivated.
The 21-year-old suspect was taken into custody shortly after fleeing the scene, authorities said.
Klaus Scharioth, the German ambassador to the US, has conveyed his condolences in calls to the White House, State Department and Pentagon, the embassy said.
Security round the airport has been tightened and an investigation is under way, said Boris Rhein, interior minister for the state of Hesse. "Whether the incident was linked to terrorism I cannot say at this stage," he told journalists.
A spokesman for Frankfurt airport operator Fraport said the shooting took place in a U.S. Army bus in front of Terminal 2.
Chancellor Angela Merkel, speaking in Berlin, confirmed the deaths. "We don't know the details but I would like to express how upset I am. We have to do everything we can to find out what happened," she told a joint news conference with Portuguese Prime Minister Jose Socrates.
The U.S. Army and Air Force and German police at the airport were not immediately available for comment.
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