More than thirty firefighters are tackling a blaze at a block of flats in West Hampstead, London.

Video posted on social media shows flames billowing up the balconies of a number of apartments in Heritage Lane.

London Fire Brigade (LFB) said it received 40 calls to the fire at 11.25am and that four balconies were alight.

Fire crews from West Hampstead, Paddington, Willesden, and surrounding fire stations are in attendance. 

The cause of the fire is not presently known and no casualties have been reported.

London Ambulance Service was called and while they remain on the scene they have not treated any patients.

The London Fire Brigade said in a statement that 35 firefighters were in attendance along with six fire engines. 

“The cause of the fire is not known at this stage,” LFB said. 

Shortly before 1pm the fire was said to have been extinguished. 

Building developer Ballymore said: “We can confirm that the fire which broke out this morning has now been put out and there have been no reported injuries.

“The safety and security of residents is our utmost priority and we are in close communication with all affected residents.

“Our primary task in the coming hours is to ensure their security and to organise temporary accommodation.

“We are working closely with emergency services to find the cause of the fire.”