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.
More top news
On a tour of the North East today, the Chancellor George Osborne made a series of promises which he claimed would help create 50,000 jobs.
Hundreds of people are expected to take part in two separate demonstrations in Newcastle tomorrow.
Teesside car parts manufacturer Nifco has announced a new £50 million deal with US car giant Ford.