Emergency services were called to reports of an “industrial accident” in Smalden Lane at around 2.15pm on Tuesday (July 26).
Two air ambulances, a land ambulance and a rapid response vehicle descended on the scene alongside police.
“We are asking motorists to avoid the area and to find alternative routes where possible,” a spokesman for Lancashire Police said.
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Smalden Lane remained closed in both directions for several hours and a diversion was put in place.