An image from last summer's attack. AP The US embassy in Oslo caused a huge scare and evacuation when it forgot to remove a "practice bomb" from an embassy car, Norwegian newspaper VG reports.

Norwegian police discovered the device under the vehicle at 11:30am today when it was stopped on its way into the embassy by security staff. The police swiftly evacuated a 500-meter (1640 foot) radius around the embassy and sent a large number of police forces into the area.

At 1:30pm the police tweeted that the area was clear and that the device was harmless. It was discovered to be a practice-bomb used for exercises at the embassy, VG reports.

In case you need reminding, it is almost exactly one year ago that a terrorist struck with bombs in central Oslo, part of a wider attack that eventually led to the deaths of 91 people.