OSLO, Norway (AP) -- The head of an asylum center in Norway says more than 20 people were injured when a group of men armed with bats and iron bars attacked the facility.
Police are investigating the brawl at the Nordbybraaten center for asylum seekers but say they have not captured any suspects.
The center's director, Ole Morten Lyng, says 40 to 50 men were involved in the "planned" attack some 40 miles (60 kilometers) south of Oslo late Thursday. He did not know how serious the injuries were.
Lyng was quoted by Norwegian news agency NTB as saying the attackers were Chechens. But he later told AP their nationalities were not clear.
The center houses some 200 refugees from Iraq, Afghanistan, Iran, Russia, Somalia and Eritrea.
It was the second attack in a week at asylum-centers in Norway.
On July 18, police said a 16-year-old Somali boy was seriously wounded after several shots were fired at an accommodation center for asylum-seekers in Asker, outside Oslo.
Police believe the shots were fired from long range, with a "heavy-caliber" weapon.
The boy was in his bed on the top floor of a two-story Hvalstad asylum center when a bullet pierced the wooden wall and hit him in the stomach.
No suspects have been arrested in the shooting, and it wasn't immediately clear whether the cases were related.
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