The Associated Press is reporting, 2 U.S. airmen were shot and killed hours ago at an airport in Frankfurt, Germany.

The gunman attacked the airmen on a bus that was waiting outside Terminal 2 at the Frankfurt airport, killing the bus driver and a passenger, seriously injuring another person, and inflicting light injuries on a fourth.

The U.S. Air Force Europe spokeswomen Maj. Beverly Mock told the Associated Press that all four victims were airmen.

The shooter, Arif Uka, is a male from Kosovo, a disputed territory in Eastern Europe, which was a part of the now disintegrated Yugoslavia. Kosovo has been fighting for its independence in the early 1990s, which lead to the Kosovo War in 1998. The UN stopped the war with force, and today, many countries recognize Kosovo as an independent nation.

The Kosovo Interior Minister, Bajram Rexhepi, is quoted in the AP article, stating, “This is a devastating and a tragic event. We are trying to find out was this something that was organized or what was the nature of the attack.”

US House Homeland Security Committee member, Rep. Patrick Meehan, who is currently located in Washington, said that it looked like a terrorist attack.

However, the German news agency quoted the Interior Minister for the state of Hesse Rhein claiming that there are no indications of this being a terrorist attack.

U.S. Troops are still stationed throughout Germany, with their numbers totaling about 50,000. They are responsible for multiple operations in Frankfurt, such as the Ramstein Air base, a logistical hub for the Middle East operations.