SEOUL — A U.S. soldier was detained and questioned by South Korean police Sunday for allegedly robbing a taxi driver and allegedly attempting to rob a second driver in Seoul, according to police officials.

The soldier, who police identified only as “Private W,” was released to U.S. military custody after the initial round of questions, police said.

They said the soldier threatened a taxi driver with a knife and a chunk of brick around 11:20 a.m. Sunday in Seoul’s Gangnam district. After stealing 70,000 won (about $70) from the man, police said he hailed a second cab and attempted to rob that driver. Police said they detained him on the scene.

An 8th Army spokeswoman declined to name the soldier because he has not been charged. The spokeswoman said the soldier is back with his military unit, has been placed on legal hold and the Criminal Investigation Command and Korean National Police are conducting a joint investigation.

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