Kidderminster rocket firm blaze causes evacuation.
A fire at a Worcestershire company which makes rocket engines for missiles has now been put out, police have said.
A 600m exclusion zone was set up at Roxel in Summerfield Lane, Kidderminster and residents and businesses were evacuated.
Six fire crews tackled the blaze, which started at about 08:30 GMT.
West Mercia Police said the exclusion zone has been lifted and the A449 Kidderminster to Worcester road has reopened.
A rest centre for those evacuated was set up at Wyre Forest Glades Leisure Centre.
Roxel designs and manufactures rocket motors for tactical missiles.
Supt Kevin Purcell said the closure of the A449 was necessary for public safety.
He said officers were deployed to maintain the cordon placed around the site and give support to the fire service.
Police said they were liaising with local authorities to co-ordinate their response to any community impact the fire may have.
There were no reports of injuries at the scene, West Midlands Ambulance Service said.
One of the firms evacuated, Eco2Solar on Hoo Farm Industrial Estate, which provides renewable energy installations, said some staff were working from home.