About 50 firefighters tackled a blaze at Lafarge Dunbar’s cement works on Wednesday afternoon after a fire broke out.
The alarm was raised just after 12:30 at Lafarge cement works in Dunbar, where there was a fire in a concrete bunker housing about 50t of rubber tyre chips.
Nearby residents were warned to keep their windows shut due to the toxic black smoke.
At the height of the blaze, eight fire appliances were involved.
Nigel Blair, works manager at Lafarge, said: "We can confirm no one has been harmed in any way by this incident.
"We have two tyre chip storage bunkers. The one containing the fire was out of service for maintenance and, as such, most of the tyres had already been removed.
"We can’t say at this stage what might have caused the fire, but we will be carrying out a full investigation in co-operation with the fire service.