Hanoi police arrested the owner of a bar where they found illicit drugs last weekend, newswire VnExpress reported.
Tran Mai Khanh, the 37-year-old owner of the Sis & Bro in Tay Ho District, was taken in for allegedly "organizing the illegal use of drugs."
Several dozen officers raided the five-story bar early Saturday and found six men and five women under the influence of drugs in a karaoke room on the third floor.
Police checked all the floors and seized two packs of ketamine, 46 ecstasy tablets, and nine packs of methamphetamine.
The 11 customers were also arrested. Subsequent tests showed they had used drugs.
They are being detained for further investigations, the police said.