Oldbury plastics factory fire is being treated as arson
A fire at a plastics factory in the Black Country in which smoke could be seen about 50 miles (80km) away is being treated as arson.
The blaze broke out in the roof of the Teknor Apex factory in Tat Bank Road, Oldbury, on 29 April.
Sandwell Council said the front of the building had been demolished for safety reasons.
West Midlands Fire Service said it was working with the police as part of the investigation.
A West Midlands Police spokesperson said: "Inquiries are currently at a very early stage and officers will be examining any available CCTV, as well as speaking to potential witnesses."
The council said the site has been fenced off, awaiting final demolition.
The fire service said 75% of the building was damaged and smoke from the blaze was seen in the Malvern Hills and parts of Staffordshire and Warwickshire.
The road was closed and the area evacuated, as more than 70 firefighters tackled the blaze.