Wigan factory evacuation: Everything we know so far

Here's what we know so far about the incident:

As many as 30 emergency vehicles raced to the scene and evacuated 230 workers from the factory.

Staff were treated at the scene for the effects of the ammonia, and 10 people were taken to hospital as a precaution.

Firefighters isolated the leak and the air quality was tested by monitoring systems. Experts were quick to reassure those living and working in the area that there were no causes for heath concerns.

Engineers are now investigating how the gas leak occurred.

Bakkavor Meals have been contacted for more details.