A toxic chemical cloud that threatened motorists on one of Britain's busiest motorways and residents across the Black Country has dispersed, say police.
Officers warned motorists on the M5 to avoid a low-hanging white phosphorous cloud drifting south from an Oldbury factory fire.
Travellers were told to keep their windows shut and turn off ventilation systems. But police said the cloud, which measured 50ft by 400ft and could cause skin irritation and breathing difficulties, has broken up.
A West Midlands Police spokeswoman said: "Three hours after the 12.30pm fire, emergency services advised that the cloud had been dispersed by the wind and any risk to health was greatly diminished.
"Police were visiting homes in the immediate area to reassure families and stressed that anyone experiencing any of the above symptoms should seek medical advice."
Officers continue to investigate the cause of the fire at Rhodia Consumer Specialities in Trinity Street, Langley, in Oldbury.
Anyone who was exposed to the gas and is suffering any symptoms was urged to seek medical help.