The exact cause of a car explosion that killed at least eight people in India's capital is still being investigated as the rest of the country remains on high security alert, local media is reporting.

Twenty people have been injured in the explosion, which took place in the historic Red Fort in densely populated Delhi.

Here's what we know.

What happened?

Just before 7pm, local time, a blast occurred near the gates of Red Fort Metro station.

It is believed to have come from a Hyundai i20 car parked near a traffic signal, Home Minister Amit Shah told local media.

"A slow-moving vehicle stopped at a red light. An explosion happened in that vehicle, and due to the explosion, nearby vehicles were also damaged," Delhi Police Commissioner Satish Golcha told reporters.

The explosion trigger

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