Electrical items and cash were stolen after burglars entered a flat and threatened the owner.
The incident happened in Sheep Street, Bicester, between 12.45am and 1.20am yesterday, Tuesday, and police are appealing for witnesses.
Four people were seen running off towards St Johns Road and may have been acting suspiciously earlier on, in Franklins Yard.
One of the offenders was white, 5 ft 7 ins and of a slight build.
Anyone with information should contact Det Sgt Dick White on 101.
Alternatively, contact independent charity Crimestoppers anonymously on 0800 555111.