A man has been released under investigation for an alleged separate incident after a search of a Calderdale house saw the bomb disposal team attend.
Calderdale police officers were called to Swift Place in Ripponden on Friday as part of a separate investigation.
While searching the property officers came across what they believed was a grenade.
Neighbouring homes were evacuated as the army disposal team was called from their base in Catterick, North Yorkshire.
However West Yorkshire Police has since confirmed that the grenade was a replica.
A spokesperson said said enquiries at the property were conducted in relation to an earlier arrest of a man on suspicion of fraud.
The man has since been released under investigation.
The army's bomb disposal unit explained
The specialist EOD army unit is responsible for counter terrorist bomb disposal and Explosive Ordnance Disposal (EOD), the recovery and safe disposal of conventional munitions.
The army regiment also inspect and licence ammunition storage and enforce explosives safety regulations.
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