Police were called to a house in Brentwood, Essex, over a dispute between neighbours in which a door had been damaged.
A man and a woman were arrested at the scene in Sawyers Grove at around 7.30am on Friday.
When officers arrived, they forced their way into a property and found “a number of small items”, police said.
Explosive Ordnance Disposal experts were called to the scene and are currently examining the objects to establish what they are.
A number of homes in a 100-metre area nearby have been evacuated as a precaution while the investigation continues, Essex Police said.
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