The Delhi police have also registered a case under the anti-terror law though they haven't given a reason for it. So, there is no clarity yet on what caused the blast and who, if anyone, is behind it. Authorities say eight people were killed in the blast, while 20 others were injured. An update is expected later today.

India's capital Delhi is blanketed in toxic smog every autumn, but the pollution is already so bad that it's drawn protests as authorities tell students to stay home.

Authorities in India are investigating a deadly blast near a busy metro station in New Delhi. The explosion late Monday near the historic Red Fort killed at least eight people and injured several others.

The move follows a weekend protest where police detained dozens of people demanding cleaner air, a rare public demonstration against pollution in the Indian capital.

At least eight people were killed on Monday in a car explosion near the historic Red Fort in a densely populated area of the Indian capital of New Delhi, a police spokesperson said. It was a rare blast in the heavily guarded city of more than 30 million people.

A car blew up near the historic Red Fort in India's capital New Delhi, killing at least eight people, police said, adding that the cause remained unclear.

The conspirators behind the attack will not be spared,” Prime Minister Narendra Modi said after the blast near the historic Red Fort, which injured at least 20 others.

Following the Delhi blast, many of the victims are experiencing hearing loss and pain in the ears. The victims are undergoing treatment at Delhi’s LNJP hospital