New Delhi, March 22 -- Heathrow Airport authorities have been accused of "clear failure" after Europe's busiest airport was forced to shut down on Friday due to a fire in a single electricity substation.

Tens of thousands of passengers were left stranded across the world after the Heathrow shutdown prevented flights to fly to and from the airport. Many of them are still stranded even as the operations have begun slowly.

The unprecedented blaze exposes the 'vulnerability' in the country's infrastructure, Daily Mail reported.

Eight long haul flights from the British Airways finally took of Friday evening after a day of chaos and gutted journeys. However, the incident put Heathrow Airport under widespread criticism for its inability to re...