A cloud of orange smoke has been spotted pouring from a factory in Billingham, Stockton-on-Tees after residents heard a "loud bang".
Emergency services attended the site of a fertiliser company in Haverton Hill following reports of an industrial incident.
Pictures online show a plume of orange smoke spilling into the sky.
Residents in the surrounding area described hearing a "loud bang" which "sounded like a plane".
A cloud of orange smoke has been spotted pouring from a factory in Billingham, Stockton-on-Tees after residents believed a "loud bang" | Lynsey FlemingCleveland Police confirmed there was a gas leak at the site but said there were no injuries or wider risk to the public.
A spokesperson said: "Emergency services have attended the site of a fertiliser company in Haverton Hill this lunchtime after reports of an industrial incident involving the small release of a gas from the facility.
"This is now dissipating, and the incident is beginning to stand down.
"There are no reports of any injuries to anyone and there are no off-site implications or further risk to the public."
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Two fire engines from Stockton Fire Station attended the scene and stood down just after 1pm.
A spokesperson said: "Cleveland Fire Brigade were called to an incident on 24/05/24 at 12.28pm on a site in Haverton Hill after reports of an industrial incident involving the small release of a gas from the facility.
"There has been assurance that the release of the gas quickly dispersed within the atmosphere resulting in no off-site implications for members of the public."
It follows a similar leak in May 2018 which saw the same orange-coloured cloud in the sky.
Two fire engines from Stockton Fire Station attended the scene and stood down just after 1pm
|Lynsey Fleming
An investigation was carried out by the Environment Agency following the incident.
The Government said it was caused by an "unexpected failure" of equipment at a facility which "could not have prevented" the explosion.
At the time, the firm said an "automatic safety device" had been activated.