Detective Inspector Paul Woods, from Northumbria Police said:
"At this stage there is no information to suggest any danger to the public. However, we recognise the theft could cause concern and I'd like to reassure people in the area we are doing everything possible to trace the firearms and the people involved.
"I'd urge anyone with information to contact police as soon as possible. There is an extra police presence in the area."
Any witnesses to the theft or anyone with information is asked to contact Northumbria Police on 101.
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Emma Jesson brings you Sunday night's forecast
Wet and windy spells, interspersed with drier interludes this week. Breezy with wintry showers, variable temperatures and a weather warning
Mostly cloudy, some bright spells, rain on and off and blustery. Milder temperatures than on Saturday