At least 84 people have died after gunman opened fire at an island youth camp in Norway, hours after a deadly bombing in the capital, Oslo, police say.

Police have charged a 32-year-old Norwegian man over both attacks.

The man dressed as a police officer was arrested on Utoeya island after an hour-long shooting spree. The search for other possible victims continues.

The Oslo bombing killed at least seven. Prime Minister Jens Stoltenberg told reporters on Saturday morning that the attacks were “a national tragedy”.

"Never since the Second World War has our country been hit by a crime on this scale," said Stoltenberg, whose offices were among those hit by the blast.

The Tages-Anzeiger newspaper reported that the Swiss foreign ministry had said that it was trying to find out if there were any Swiss victims. Helplines have been set up at the regional consular centre for the Nordic Countries (0046 8 676 79 00) and at the foreign ministry (0041 800 24 73 65, office hours 0041 31 323 30 99).

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