Anders Behring Breivik
© unknownAnders Behring Breivik
Norwegian terrorist suspect Anders Behring Breivik has made a confession to involvement in the armed attack on Utoeya Island that left 87 people dead, Oslo police say.

On Saturday, during an interrogation by the Oslo police, Breivik confessed to firing weapons on July 22 on Utoeya Island, which is located near the Norwegian capital.

On the same day, a massive bomb explosion rocked government headquarters in Oslo, killing seven people and leaving at least 15 others injured.

Breivik is also a suspect in that incident.

The death toll in the two attacks is currently 94, but it could rise higher since some people are still missing in the Utoeya Island attack and others in critical condition in hospital could die.

An Oslo police spokesman told the Norwegian newspaper Aftenposten that the interrogation could take up to several days, and Breivik could face a maximum of 21 years in jail.

Breivik's lawyer Geir Lippestad told Norwegian public broadcaster NRK television, "He has confessed to the factual circumstances."

Breivik described his actions as "gruesome but necessary," and said he would explain himself at a court hearing on Monday, the state run BBC reported.

According to the witnesses, the shootings were heard from "two different places on the island at the same time" meaning that there could have been two gunmen involved in the terrorist attack.

The police spokesman said there is no information on a second gunman so far.

Witnesses said the gunman, who wore a police uniform, was shooting for one and a half hours before the police arrived and arrested him.

Breivik has extreme right-wing views and expressed his hatred for Muslims, leftist parties, and the youth wing of Norway's ruling Labor party on the internet before the shooting incident.