Justin Bieber's tour bus was raided by Swedish police who allegedly found marijuana on board Wednesday night, TMZ reported, citing a Swedish newspaper.

Police reportedly boarded the bus in Stockholm as it pulled up at the arena where Bieber was performing. Authorities found a "small amount" of what appeared to be pot.

A police spokesperson told the Aftonbladet newspaper officials at first detected a "strong smell" of marijuana coming from the bus as they tried to control a huge crowd of fans that had gathered outside Bieber's hotel. The publication also noted that police said they found a stun gun, which requires a permit

No arrests have been made as of yet and it is unclear of what Bieber's location was during the bust, meaning if he was on the bus or already in the arena when police raided the vehicle.

While in Stockholm Bieber was reportedly spotted with his ex-girlfriend Selena Gomez. A video posted on YouTube claimed that the two singers left the Grand Hotel in Stockholm together, though nothing has been confirmed by the stars or their reps. They were also spotted kissing after his concert on Oslo on April 18, a source told People.