New Delhi, March 21 -- Alerting travellers and passengers via its official social media account on X (formerly known as Twitter), London's Heathrow Airport has said that it will be closed on March 21 and said "we apologise for the inconvenience".

Here's all you need to know about date, time and reason for the closure.

Writing on X, the official account said, "Due to a fire at an electrical substation supplying the airport, Heathrow is experiencing a significant power outage. To maintain the safety of our passengers and colleagues, Heathrow will be closed until 23h59 on 21 March."

As per the post late on March 20 local time (early in the morning IST on March 21), the airport will be closed for the full day on Friday till 11.59 pm and op...