More than 40 homes have been evacuated as firefighters tackle a large blaze at an industrial unit.
People living nearby reported hearing explosions and the fire could be seen over a large part of Bristol.
Avon Fire and Rescue Service were called the fire at a workshop at the Strachan and Henshaw building in the Speedwell area at about 18:20 BST.
A spokesperson said crews were likely to be tackling the blaze through the night.
Avon and Somerset Police said that 44 properties had been evacuated and said those without a place to go could take refuge at St John’s Church on Lodge Causeway.
Chief fire officer Mick Crennell called the blaze a “major incident” and tweeted that crews were working “very hard in challenging circumstances to keep our communities safe”.
The cause of the fire is not yet known and there are no reports of any injuries.
Police advised nearby residents to close windows and to remain inside if possible due to potential smoke inhalation.
A number of roads have been closed and motorists have been asked to avoid the area.
Kerry McCarthy, Labour MP for Bristol East, tweeted: “Very concerned to see news from Speedwell. Hope everyone is safe, including firefighters from AvonFireRescue.”
At the time the fire service said crews had been “firefighting in difficult conditions”.