Vanessa Pearce
BBC News, West Midlands
West Midlands Fire Service
More than 70 firefighters are at the scene of the factory fire
Firefighters are dealing with a "significant" blaze involving 20 tonnes of tyres in the West Midlands.
Four factory units are involved in the fire, with several nearby homes evacuated "as a precaution".
More than 70 firefighters have been at the scene on Great Bridge Street, between Tipton and West Bromwich after the fire service was called at about 10:40 BST.
Seventeen fire engines have been sent to the site, said West Midlands Fire Service (WMFS), along with several specialist resources. No casualties have been reported.
Melvin Cooper
Roads around the Great Bridge Street blaze have been closed
The fire has sent a thick plume of smoke into the air with members of the public being warned to stay away from the area.
One social media user posted on X that it could be seen from as far away as Bilston, about four miles away.
Initially, the fire involved a single-storey unit measuring 100m by 100m, WMFS said, but it later confirmed four units were involved.
"Due to structural concerns and a partial collapse in one area a structural engineer has been requested to attend," said WMFS.
Firefighters were working to prevent further fire spread and contain the blaze.
West Midlands Fire Service
A drone operative is helping fire crews tackle the blaze and a heat map has show the scale of the blaze
West Midlands Police have co-ordinated the evacuation of several homes on Elwell Street, with residents being relocated, the service said.
A drone team was on site alongside three hydraulic aerial platforms and high-volume pump team, it added.
Water was being taken from a nearby canal.
It thanked local residents and businesses for their patience while crews work to bring the fire under control.
They were advised to keep doors and windows closed due to the large volumes of smoke in the area.
West Midlands Fire Service
No casualties have been reported, said the fire service
Representatives from National Grid, Severn Trent, the Environment Agency and Sandwell Council were also at the scene.