Swedish police raided Justin Bieber's tour bus and reportedly found marijuana last night.

The 19-year-old's coach was stopped by law enforcement officers outside the Ericsson Globe venue in Stockholm - where he was performing as part of his 'Believe Tour' - and searched.

According to the Aftonbladet newspaper, police allegedly found a "small amount" of what appeared to be cannabis on board, as well as a stun gun, which requires a permit.

Police were originally alerted to the bus after detecting a "strong smell" of weed coming from it while controlling the crowd that had gathered outside Justin's hotel.

No arrests have been made and it is not clear if 'Beauty and a Beat' singer Justin was on the bus, or was already in the arena when the raid was made.

Justin came under fire for being pictured smoking marijuana in January this year, and later apologised, writing on Twitter: "I see all of u. I hear all of u. I never want to let any of you down. I love u and ... thank u (sic)"

However, during a trip to Amsterdam last month he was rumoured to once again have smoked the herbal high - a practice which is legal under a controlled environment in the city - at a coffee shop called Easy Time, as well as consuming a cannabis-laced "space cake".

Bang Showbiz