Hundreds of millions of people have been left without electricity in northern and eastern India after a massive power breakdown.

More than half the country has been left without power after three grids collapsed - one of them for the second day running.

Hundreds of trains have come to a standstill and hospitals are running on backup generators.

In eastern India, around 200 miners have been trapped underground.

They have been moved to an area where they have access to fresh air and are not in immediate danger.

In Delhi, Metro services were halted and staff evacuated trains.

Some trains have started running again, although a full service is not expected for many hours.

The breakdowns in the northern, eastern, and north-eastern grids mean around 600 million people have been affected.