India's anti-terror force is leading the investigation into a deadly car explosion in the heart of the capital New Delhi, as Prime Minister Narendra Modi vows to bring those responsible to justice.

Police are yet to give exact details of what caused the incident near the historic Red Fort, one of India's most well-known landmarks, and the site of the prime minister's annual Independence Day speech.

The blast killed at least eight people , and injured 19 others on Monday, when flames ripped through several vehicles.

It was the first significant security incident since a shooting attack in late April that left 26 mainly Hindu civilians dead at the tourist site of Pahalgam in Indian-administered Kashmir, triggering clashes with Pakistan.

"I assure everyone that the agencies will get to

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