Firefighters from across west London are at Hounslow High Street after a blaze erupted at a shopping centre.
London Fire Brigade said it was called to the scene at the Treaty Centre at 11.42am and sent crews from Heston, Twickenham and Heathrow.
The Treaty Centre has been evacuated following the blaze, according to reports on Twitter, with shoppers flooding into cafés along the High Street.
The brigade said part of a storage room was alight at the department store.
It would not confirm the identity of the store, but it is understood to be Debenhams.
The brigade said the cause of the fire is not known at this stage.
@ryanwilofficial tweeted to say: "Fire in treaty centre Debenham, immediately evacuated & fire brigade on scene straight away!"
He also tweeted photos from the scene, one of which showed the entrance to the Treaty Centre taped off as shoppers looked on.
Damage confined to the storage room
London Fire Brigade says damage was confined to the storage room, with the blaze prevented from spreading to the shop floor.
It says the cause of the blaze remains unknown at this stage.
And with that it’s time to close the blog and let those who were rudely interrupted get back to their shopping.
Treaty Centre reopens, but Debenhams to remain closed for the rest of the day
The Treaty Centre has reopened, the shopping centre has confirmed.
However, it said Debenhams would remain closed for the rest of the day.
The extent of the damage is still not known.
Bus diversions lifted following fire
Buses have resumed serving Hounslow High Street, which was closed as firefighters tackled the blaze, says Transport for London.
Bus routes 116, 117, 235, 237 and 423 had been on diversion.
Fire now 'under control'
London Fire Brigade has just tweeted to say the blaze is now ‘under control’. The extent of the damage is not yet known, nor do we know whether the Treaty Centre has reopened.
Treaty Centre entrance taped off
@ryanwilofficial has tweeted photos from the scene, one of which shows a fire engine outside the Treaty Centre and another showing the entrance to the shopping centre taped off.
Treaty Centre evacuated - 'cafés busier than ever'
Andrew Shaw has tweeted to say the Treaty Centre has been evacuated. He says Hounslow’s cafés are busier than ever.
More than 20 firefighters tackling blaze
London Fire Brigade said it was called to the department store at 11.42am.
The name of the shop is not known but it has been named on Twitter as Debenhams, which is in the Treaty Centre, in Hounslow High Street.
The brigade said part of a storage room in the department store was alight.
It sent 21 firefighters in four engines from Heston, Twickenham and Heathrow fire stations, who are still at the scene.
Debenhams has been evacuated, according to reports on Twitter. It is not yet known if the whole of the Treaty Centre has been evacuated or if it is just the store itself.
The cause of the fire is not known at this stage.