An incident at a factory on Christmas Day was caused by an ammonia leak.
Eleven fire crews were called to a hazardous material leak at the Birds Eye factory in Lowestoft just before 4.30pm on Monday.
The engines were from Holbrook, Leiston, Wrentham, Beccles, North Lowestoft, Hadleigh, Haverhill and Lowestoft South.
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The fire crews worked alongside onsite engineers to isolate the source of the ammonia leak.
A stop time was called just after 7pm.
A spokesman for Suffolk Fire and Rescue Service said there were no casualties.
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