The town centre in Stevenage was evacuated due to an suspicious device being found on a car in Eastgate yesterday.
Police arrived at 9.05am to reports of an explosive device on a silver Vauxhall.
A cordon was set up and nearby residents asked to leave their properties while emergency services investigated.
The Explosive Ordnance Disposal Company (EOD) assisted and the device, which was a commercial-sized firework, was made safe.
The scene was cleared at 4.30pm.
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