The U.S. Navy is investigating an alleged drug ring involving a number of sailors based at the 7th Fleet's headquarters in Yokosuka, Kanagawa Prefecture, it confirmed Saturday.

"Naval Criminal Investigative Service (NCIS) is investigating Yokosuka-based Sailors for alleged drug use and distribution," 7th Fleet spokesman Cmdr. Clay Doss told The Japan Times in an email. "The Navy has zero tolerance for drug abuse and takes all allegations involving misconduct of our Sailors, Navy civilians and family members very seriously."

He declined to comment further.