Emergency services were sent to a building fire which is now being treated as arson.
Crews from Blackburn were called to reports of a building fire on Haslingden Road at around 9.25pm on Sunday.
On arrival they found the fire actually involved a shipping container, which had been used as an office on a works site.
A spokesperson for the fire service said: "Fire crews used one hose reel and one breathing apparatus to extinguish the fire.
"Crews were in attendance approximately 45 minutes and a joint fire and police investigation is now underway into the cause."
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