By Victoria Klesty

OSLO (Reuters) - When Norwegian ferry captain Jon Olsen asked the young policeman to cover his gun so as not to upset children on an island summer camp last July, he could hardly have expected that within minutes the officer would turn into a mass murderer.

Olsen told Anders Behring Breivik's trial on Thursday how Breivik, wearing a police uniform, had obliged and covered the gun in a plastic bag, saying he was just there to protect the camp after a terrorist attack on Oslo hours earlier.

Olsen even helped Breivik with his bags on arrival at the island of Utoeya, only to watch him unwrap the gun and shoot Olsen's girlfriend Monica point-blank, starting a killing spree that claimed the lives of 69 people, most of them teenage campers.

"I think Monica says something, or I did, about how he could cover his rifle, because the mood at Utoeya is a bit tense," Olsen said.

Olsen's voice betrayed little emotion. He said the shock had probably erased much of his memory.

"I see he shoots (security guard) Trond Berntsen from behind and I see Trond fall down. I don't remember if I can see him shoot Monica or not, I think I do."

Standing about 10 meters away, Olsen fled for his life into the woods and waited - in vain - for help to arrive.

"I started to feel the desperation creep into me," he said. "It's completely quiet ... we're thinking this is completely unreal. The sky should be full of helicopters."

Norwegian police, distracted by Breivik's earlier bomb attack that had killed eight people in Oslo, have been criticized for not responding faster to the calls for help from Utoeya. Continued...