Oslo Update, July 24: At least two terrorists behind Norwegian youth camp massacre - witnesses

And these witnesses go on record by giving their names. Unless this thing is made out of whole cloth (and yes that does happen particularly with hot stories), then there were two gunmen. Who knows what that means at this point.

Several young people who survived Utoya's massacre, told VG paper that the shootings were coming from "two different places on the island at the same time."

"I believe that there were two people who were shooting," VG quoted a 23-year old Alexander Stavdal.

Norwegian police arrested on Friday a 32-year-old ethnic Norwegian, Anders Behring Breivik, who is believed to be behind the attack.

The witnesses described the second man as a 180-centimeter tall, dark-haired man with Nordic appearance with "a pistol in his right hand and a rifle on his back."

http://en.rian.ru/world/20110723/165350450.html