Norwegian officials say they have found a ship buried in the ground west of Oslo, adding that it likely dates to the Viking era.

The ship was found by use of geo-radar, and archaeologists say they have no immediate plan to unearth it, but they will be using non-invasive methods to find out more about it.

Vestfold county spokesman Terje Gansum said Monday the ship burial — where a vessel is used as a container for the dead — was found in the Borre burial mounds, considered one of Norway's most important cultural heritage sites

He said Viking-era ships are always at least 15 meters (50 feet) long.

The find is next to a museum promoting the local area's Viking heritage. The Viking era was approximately 793-1066.