SEOUL — South Korean police said Wednesday that they plan to question two U.S. soldiers accused of using illegal drugs in an off-post apartment.

A Wonju police spokesman, speaking on the customary condition of anonymity, said an arrest warrant had been issued for one of two South Koreans accused of using ketamine — an animal tranquilizer — with the soldiers.

The spokesman said the man, identified only as Cho, allegedly inhaled the ketamine with the Camp Long-based soldiers and a 24-year-old South Korean woman on Dec. 4 and that the alleged drug use went back to September.

The spokesman said a urine sample from Cho, 28, tested positive for the drug and that he admitted to using it with the three suspects. Cho stated that he didn’t know the source of the ketamine, the spokesman said.

Police intend to question the woman later this week, the spokesman said.

Eighth Army officials queried Tuesday and Wednesday were unable to say whether any U.S. soldiers were under investigation or whether they were cooperating with South Korean legal authorities.

According to the U.S. Drug Enforcement Administration, ketamine — also referred to as jet, Special K, green and cat Valium — has become popular among teens and young adults at dance clubs and rave parties in the United States.

Ketamine, which runs about $20 to $25 per dose, is also "reportedly used as a date-rape drug," according to the DEA.