Dar es Salaam, March 21 -- Heathrow Airport will be closed throughout Friday over a “significant” power outage linked to a fire at a nearby electrical substation that supplies it.

The airport, which is the UKs busiest, has warned of “significant disruption” over the coming days and told passengers not to travel “under any circumstances” until it reopens.

Almost 5,000 homes remain without power after two explosions and a fire at the substation in Hayes, west London, and 150 people have been evacuated from surrounding properties.

Emergency services were first called to the scene at 23:23 GMT, and video shared on social media showed tall flames and smoke billowing from the substation overnight.

London ...