Seven Vietnamese nationals have been apprehended for suspected drug use at a foreigners-only club just southwest of Seoul this week, one month after a crackdown led to 10 drug arrests at the same place, police said Monday.

The seven Vietnamese were put under emergency arrest after testing positive for ecstasy and other banned substances in a crackdown that began at 1 a.m. Monday at a Vietnamese-only club in Siheung, 26 kilometers southwest of Seoul, according to the Gyeonggi Siheung Police Station.

They are suspected of taking drugs between late Sunday night and early Monday morning.

The police raided the club after receiving a tip-off and conducted urine tests on 127 people, including club customers and employees. The police station said it will determine whether to seek an arrest warrant for the suspects after further investigation.

The crackdown also led to the detention of seven other Vietnamese who tested negative for drug use but found to be illegal immigrants.

In early May, eight Vietnamese and two Koreans were apprehended at the same club over suspected drug use. (Yonhap)