Masked burglars carried out an armed raid in Maidenhead on Monday night.
Several raiders got into a house in Heywood Court Close at about 10.45pm.
One of them is believed to be carrying a gun and another a crowbar.
The gang searched the premises before running off empty-handed.
Police say there were about 10 people in the property at the time but none of them were injured.
They are treating the incident as an aggravated burglary.
Investigating officer, DC Iain Watkinson is appealing for winesses.
He said: "We’re keen to hear from anyone who was in the vicinity at the time and saw anything suspicious, particularly anyone running to or from the area.
"At this stage we believe this was an isolated incident."
Contact police on 101 or Crimestoppers, anonymously, on 0800 555111.
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