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An explosion was reported near the Red Fort in the Indian capital of New Delhi on Monday, in which at least eight people were killed and at least 20 people were injured, local television channels reported.

The exact cause of the blast was being investigated, city police spokesperson Sanjay Tyagi said.

However, India’s financial capital of Mumbai, as well as its most populous state of Uttar Pradesh, which borders Delhi, went on high security alert after the blast, local media reported.

“Eight people have been killed in the explosion,” Tyagi said.