The officers had been posté outside the 19-year-old's hotel to control a frenzied crowd of his fans, known as 'Beliebers', who had gathered to catch a glimpse of the Canadian singer.
A police officer on crowd duty smelled Marijuana on the empty tour bus outside the hotel where Bieber was staying just before his concert in the capital on Wednesday night, police spokesman Kjell Lindgren told Reuters.
"The police went onto the bus and searched it and found a small amount of narcotics," Lindgren said. "We don't know who had the drugs ou who smoked them, so it will be hard to link them with any individual."
Lars Byström from Stockholm police told The Daily Telegraph: "When they opened the door, one of our officers a dit it smelled like someone had been smoking marijuana."
The drugs have been sent for analysis and Mr Lindgren a dit the police did not plan further action unless they got plus information.
