The US embassy in Oslo has been hit by an explosion in the early hours of the morning, Norway's police say.

"Large resources" were sent to the area in the Norwegian capital at about 01:00 local time (00:00 GMT), police said.

"The police are in dialogue with the embassy and no injuries have been reported," a statement said.

It added that there was currently "no information about exactly what happened or who may be involved".

The embassy sustained minor damage, media reports say. The diplomatic mission's US employees have not commented.

Michael Dellemyr, who is leading the police response, told Norway's public broadcaster NRK the explosion was at the public entrance to the building.

The US embassy is located in the Morgedalsvegen district of Oslo, about 7km (4 miles) outside the city centre.

How the remains of a Victorian fishing boat from Grimsby ended up inside a house on Norway's coast.

Marius Borg Høiby now faces a total of 40 charges at his trial and denies the most serious allegations.

The charge was brought after the Council of Europe lifted his immunity, which he had as its former secretary general.

British troops in Norway will rise from 1,000 to 2,000 to address Russia's "greatest" threat since the Cold War.

Mona Juul and her husband Terje Rød-Larsen - who played a vital role in the Oslo Accords - are being investigated for "aggravated corruption".