A 20-year-old American man is under arrest, accused of slaying a German-American woman in a restaurant parking lot in Darmstadt, Germany.

The 20-year-old woman was stabbed in the neck about 6 p.m. Thursday, and she died at the scene, according to German police who interviewed witnesses. Witnesses told police the alleged suspect and the victim arrived in separate cars.

The attack took place at the McDonald’s on Gräfenhäuser Strasse on the east side of Darmstadt, according to a police news release.

Police say they do not know the man’s motive or the relationship between him and the victim.

The victim was a civilian non-appropriated fund employee assigned to U.S. Army Garrison Darmstadt, according to a military news release. Non-appropriated funds employees typically work for military-affiliated organizations that must generate revenue, such as Department of Defense-owned franchise restaurants, Army and Air Force Exchange Service stores and Morale, Welfare and Recreation programs.

Army officials declined to identify the woman, saying that next-of-kin had not been notified as of Friday afternoon.

She lived in Bickenbach, south of Darmstadt, according to police.

The man, who was arrested at the scene, may be a U.S. military dependent, police said. They declined to identify him.

German police, the German prosecutor’s office and the Army’s Criminal Investigation Command are investigating the crime.

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