A 30-year-old man from Abertillery has been arrested on suspicion of arson after a blaze at a Crumlin crisp factory.
Workers at the Real Crisp factory on the Pen y Fan Industrial Estate in Crumlin had to be evacuated in the early hours of Thursday morning.
South Wales Fire and Rescue Service said it received a call at 3.18am to Sirhowy Valley Foods.
Sixty-five firefighters from 20 stations were sent to the incident. South Wales Fire and Rescue Service said that on arrival at 3.30am, three-quarters of the building was ablaze.
Firefighters managed to contain and extinguish the fire quickly.
Vaughan Jenkins, from South Wales Fire and Rescue Service, said: “On arrival, our crews encountered a very well developed fire, involving about 75% of the building. Efforts were focusing on preventing the blaze from spreading to other units on the industrial estate.
“He expected crews to remain at the site for the remainder of the day.
“Fire investigation experts are also at the location, but the cause of the fire has yet to be established. The fire investigation into the cause of the fire will begin when the incident comes to a close.”
Police are appealing for information regarding the fire and anyone who has any information about the incident to call them on 101 or call Crimestoppers on 0800 555111.