Indian officials say a massive power outage blacked out a vast region of northern India early Monday, affecting more than 300-million people in nine states, including the capital, New Delhi.
The power cut severely disrupted transport networks including trains and metro services, while traffic light systems went out, causing huge traffic jams in some major cities.
Power officials said electricity supplies for public services like hospitals and transport are being restored on a priority basis. They said power is expected to be restored later in the day.
An investigation into the cause of the blackout is under way.