Armed police are seen at an address in the east of Oslo
Armed police are seen at an address in the east of Oslo July 24, 2011. According to local media, the police confirmed that the raid was linked to Friday's bomb blast in Oslo. Reuters

Norwegian police freed several people who were briefly detained Sunday after a raid prompted by attacks that have killed 93 people, a police lawyer told Reuters.

"The people detained and brought in for questioning have been released. They were in no way linked to the case," Anders Frydenberg said. Police are trying to see if the main suspect acted alone.

Frydenberg said that no explosives were found in the raid on buildings in north east Oslo.