WIGAN firefighters tackled a blaze at a disused mill for the second time in a month.
The third floor of the mill site was also targeted in April sparking a joint operation involving Greater Manchester Police and the North West Ambulance Service.
The latest incident is being treated as a deliberate ignition.
Atherton Crew Manager Rob Macauley said: “The mill is right across the road from the fire station and as soon as we got the call and started to make our way there we could see black smoke coming from the window.
“We were struggling to gain access to the building through the gates and as we were trying to get in we heard over the radio that there could be someone inside.”
Crews spent more than three hours searching the mill and nobody was found. The fire was caused by rubbish, officers said.