HELSINKI -- Several dozen women reported being raped or sexually assaulted at two music festivals in Sweden last weekend, putting further scrutiny on refugees pouring into the country.

Police Inspector Leif Nystrom said there had been 32 reports of attacks by boys or young men at a three-day festival in the city of Karlstad, 300 kilometres west of Stockholm. The youngest alleged victim was 12.

Police have not released the identities of the seven young men now wanted for questioning, but officers have told local media they are "foreign young men."

Two were reported arrested and released because of their age.

Nystrom refused to give details of the suspects or comment whether they are migrants or foreigners, pending the outcome of the investigation.

Meanwhile in Norrkoping, police told local media that they were investigating five similar cases of alleged rape and more than a dozen suspected sexual assaults at the Bravalla Festival in the city, southwest of Stockholm.

After playing in Norrkoping, British rock band Mumford and Sons posted a note on their Facebook site saying they were "appalled ... and gutted by these reports" of rape and sexual assault.

The band said Tuesday they would not play Bravalla again unless police and organizers could assure them that they are "doing something to combat what appears to be a disgustingly high rate of reported sexual violence."

Swedish Prime Minister Stefan Lofven described the situation as "totally unacceptable" and said that laws on sexual assault would be tightened.