Firefighters are attending a serious blaze in the cargo area at London Heathrow Airport.

Twenty fire engines and around 100 firefighters are tackling the fire in a warehouse, located on the southern perimeter of the airport, west of Terminal 4.

A spokeswoman for Heathrow says that the fire is located in a Servisair building but is "not affecting [flight] operations".

The London Fire Brigade states that it was alerted at 13:16, and that crews from both the airport and surrounding fire stations are attending.

"The cause of the fire is not known at this stage," it adds.

 Heathrow fire

Source: Air Transport Intelligence news