An injured woman is helped by a man at the scene of a powerful explosion that rocked central Oslo Reuters

A bombing in Oslo, Norway has been labeled a terrorist attack. On Friday, a car bomb exploded outside of government headquarters in the Norwegian capital, killing at least seven people and injuring many more. Police quickly evacuated the area and national guardsmen surrounded the city.

The blast was followed hours later by an attack at a youth camp on an island outside of Oslo. A man dressed in a police uniform opened fire on teenage campers, killing at least nine. Some reports say as many as 20 people died in the shooting.

The man, who police say is a Caucasian male and a Norwegian citizen, was arrested after counter-terrorism forces stormed the island.

While no connection between the events has been established, police say they have good reason believe they are linked.

Norway's Prime Minister Jens Stoltenberg, whose office was in the bombed building but remained unharmed, addressed the nation Friday night.

No one will bomb us to silence. No one will shoot us to silence. No one will ever scare us away from begin Norway, Stoltenberg said the press conference.

You will not destroy us. You will not destroy our democracy or our ideals for a better world... We will find the guilty and hold them responsible.

The New York Times reported that militant group Ansar al-Jihad al-Alami, or the Helpers of the Global Jihad, claimed responsibility for the bombing, but a terrorism expert told BBC that the terror group was not behind either attack.

It has also been proposed that the attack was the work of Al-Qaeda, targeting Norway for their involvement in Afghanistan.

What is known is that three suspected terrorists were arrested earlier this month for an alleged plot to attack Norway and Germany. Additionally, intelligence agencies this month said that The Islamic Movement of Uzbekistan had been planning a European attack from the mountain in Pakistan. Some of the militants are believed to be European citizens.

Analysts are also focusing their attention on domestic extremist groups, believing that the attack on the government building, as well as the government sponsored summer camp, could be politically motivated.

Stoltenberg's Labour Party has been in power since 2005.