It could take a week to pinpoint what caused the Recycling Lives blaze, a fire chief said today.
Firefighters from across Lancashire, along with colleagues from Greater Manchester, were still at the scene this morning.
Area Manager Simon Fryer said it was a “significant fire” covering an area about 30 metres by 20 metres.
He said: “The fire was contained to the original area. We were able to move an adjacent pile using grabbers from the site and isolate the fuel to stop it from spreading further.”
Mr Fryer said the smoke at the height of the blaze was not a major risk, but he advised neighbours to keep their windows closed until the smoke had subsided.
He said: “We have started the investigation process and that will proceed over the next week or so, at which point we wil be able to establish the cause of the fire.”