They were called to a house in Burnopfield, County Durham.
UPDATE AT 1PM:
A man has been arrested following a stand-off in County Durham.
Police have been surrounding a property on Lintz Terrace in Burnopfield for nearly 24 hours.
It’s after they’ve been trying to negotiate with a 47-year-old after making threats and throwing petrol bombs.
Despite repeated attempts by specially trained negotiators, and with no resolution in sight, officers entered the property at approximately 11.30am.
The man had barricaded himself in the loft.
Following further negotiations he left the loft and was arrested for threats to kill and criminal damage.
No police officers or the man arrested were injured during the incident.
Durham Police have thanked members of the community for their patience and co-operation during the incident.
A quick update from Chief Inspector Richie Allen in Burnopfield:
Armed police are still dealing with an incident in County Durham.
It happened yesterday afternoon after they were called to a house in Burnopfield.
The 47-year-old made threats to police at his property in Lintz Terrace.
Negotiators are continuing to engage with the man after he threw petrol bombs at them yesterday.
There is not believed to be any risk of harm to other residents in the area, but the cordon will remain in place until the situation is resolved.
An update from Chief Inspector Richie Allen from the scene: