Seven people have been arrested on suspicion of gang rape.

A woman in her 20s was raped indoors north of Stockholm on Sunday.

"The investigation is in its early stages, so it is difficult to comment on what the evidence will look like," said prosecutor Anders Hirsch.

The suspects are between 20 and 30 years old, including both men and women.

Two women in their 20s are now being requested for detention, as the evidence against the other five has weakened.