During the night towards Saturday, many young people gathered at a party at Bölesholmarna in Umeå.
A police patrol witnesses there when someone sells drugs.
"The suspects manage to leave the scene but are later stopped in a car.
The house search is carried out in the vehicle and body searches and additional drugs are found ", the police write on their website.
Five people were arrested.
Two of the suspects are very young, the youngest is in his 15s.
Three of them are arrested by emergency prosecutors, but released after questioning.
The suspicions of drug offenses through transfer remain.
- The investigation shows that the young people's purpose in visiting the party was probably to sell drugs, says Sofia Möller, head of the preliminary investigation at the police in Umeå.