"DUM-DUM"

A surgeon at a hospital that treated 35 of the wounded young people said Breivik seemed to have used a type of "dum dum" bullet that fragments inside the body to cause maximum damage.

"These bullets don't explode inside the body but fragment into pieces more quickly than other bullets," Colin Poole, chief surgeon of the Ringerike district hospital, told reporters.

While Breivik hunted down victims on Utoeya, it took police a full hour to get a team of elite forces to the island after one boat, overloaded with officers and equipment, was forced to stop when it began to take on water.

Norwegian television managed to charter a helicopter and filmed the killer before the police showed up. When police did arrive, Breivik gave himself up without a fight.

"He had at that point used two weapons and had been, and was still, in possession of a substantial amount of ammunition," Johan Fredriksen, chief of staff at Oslo police. "Thus, the police's response has hindered further killing on the island."

The Oslo court is due to rule on a formal police request to keep Breivik in custody, a requirement within 72 hours of an arrest. An exact time for the hearing has not been set but is likely after 1 p.m. (1100 GMT).

Police can, for instance, request detention of eight weeks in solitary confinement with no access to news, letters or visitors, except a lawyer. That then can be extended.

Police have said a trial could be a year away.

Under Norwegian law, a suspect can be sentenced to a maximum of 21 years in jail, but that can be extended if courts decide there is a risk of repeat offences.

"In theory he can be in jail for the rest of his life," said professor of criminal law at the University of Oslo, Staale Eskeland.

Norway will also stop for a minute of silence at midday and there will be a torch-lit procession in the evening. Norwegian markets will also reopen on Monday, but bureaucrats whose offices have been wrecked will have to go to alternative offices.