The 'loud bang' coming from Fawley refinery on Friday night has been caught on a doorbell camera by a nearby resident.
The footage captures the moment the 'explosion' was heard across the waterside area just after 8.40pm.
Residents reported feeling their houses shake and windows rattle as sirens went off.
Fire crews at Hardley fire station were on standby as a precaution while police rushed to the scene.
In a statement, ExxonMobil said: "The cause of the noise earlier this evening was a sudden release from a utilities air line on a unit already shut down for maintenance.
"There was no risk to communities, there have been no injuries and operations are continuing as normal."
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