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Police confirmed they locked down the district in the Norwegian capital of Oslo.

Operations manager Marita Aune said a "bomb-like object" was found and police "cordoned off a large area".

(Image: TWITTER)

Cops said a man has been arrested over the apparent bomb plot – and the bomb squad was deployed.

All restaurants and shops were shut down while officers swooped in the scene.

Officers are believed to have carried out a controlled explosion on the "bomb-like device".

(Image: TWITTER)

"The noise from the blast was louder than our explosives themselves would cause," a police spokesman said, while adding that further investigation would be conducted at the scene.

The device had appeared to be capable of causing only a limited amount of damage, the police said earlier.

Eyewitness Malin Myrvold said: "Everything is blocked off. All restaurants and shops are closed and the street is empty."

She said it was "frightening" in the wake of the truck terror attack in Stockholm, Sweden, which killed four and saw a man arrested for terrorism.

(Image: TWITTER)

It comes just days after a bombing of a Metro station in St Petersburg, Russia.

There are no reports of anyone being injured.