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A U.S. military official said initial reports were that two people had been killed, including the driver of the bus. They were U.S. Air Force airmen from Lakenheath base in the United Kingdom, said the official, emphasizing the information was preliminary.

Two others are wounded, said the source, who was not authorized to speak publicly about the incident. They were security forces on their way to a deployment, the source said, without saying specifically where they were heading.

They were flying commercial, not on a military plane, according to the source.