Pop star Justin Bieber's European tour is again making news for something other than his music -- this time for a police search of his tour bus in Sweden.
Stockholm police found a small amount of unspecified illegal narcotics on a tour bus that Bieber and about nine others had taken to an arena Wednesday, Stockholm police spokesman Varg Gyllander said.
Authorities searched the bus at the arena after a police officer smelled marijuana near the vehicle when it was outside a Stockholm hotel, Gyllander said. The Bieber team had left the bus before police searched it.
The case is under investigation, but no arrests were made and no charges have been filed, Gyllander said. For a charge of possession of narcotics, police must find it on the offender, he said.
The Stockholm concert proceeded as scheduled. Bieber's next concert is on Sunday in St. Petersburg, Russia.
Earlier this month, Bieber drew criticism over a remark he left in the guestbook of the Anne Frank House in Amsterdam, Netherlands. He suggested that Frank -- the teenage diarist who died in a Nazi concentration camp in 1945 -- would have been a fan of his. Critics accused him of being narcissistic, but others, including Frank's stepsister, criticized the uproar and said Frank might indeed have been a fan.