What we know:
Witnesses living on Hill Street said that at around 8.45pm they saw smoke rising from the site and what they initially thought was a small fire on the south western corner of the ETS Chemical handling block on the corner of Gerry street and Marshalls Lane.
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After closer examination though they called the emergency services who now have the fire under control.
There are no buildings next door to the facility.
Explosions have been seen and heard across the estate and rancid smoke has been blown away from the town by the strong winds.
At this point there have been no reports of injury and the cause is unknown.