Firefighters tackling cargo blaze at Heathrow

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 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.