Monday evening was busy as usual near the Red Fort metro station in India's capital Delhi when the sound of a loud blast broke through the cacophony on the streets.

An explosion in a car killed at least eight people and injured more than 20. It was so powerful that several vehicles nearby almost melted, and people could hear the blast from kilometers away.

The police are still investigating what caused the blast but the fact that it happened in one of the most secure and busy areas of Delhi has shocked people.

On one side is Chandni Chowk - a busy trading and clothing hub that is busier than usual at this time of the year due to the peak wedding season.

And on the other side is the 17th Century Red Fort which attracts thousands of tourists every day.

Sandwiched between the two is the road where the explosion took place. Within minutes, confusion and alarm spread from the scene to the rest of the city.

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Mohamed Hafiz, who lives less than 200m from the spot, said his house shook and he and others ran out thinking it was an earthquake.

What he saw on the street terrified him: people were running in all directions, cars were on fire, and bodies lay on the road. Some locals were trying to help the injured.

As local media broke the news, fear and panic swept through the city. Police declared a high alert, and neighbouring states quickly followed suit.

After visiting the hospital, we drove to the site of the blast. It was jarring to see the roads empty here, as the area is usually teeming with people late into the night.

There were only security personnel or journalists around. Officials had relaxed restrictions and journalists could go closer to the site.

The scene told the story of the blast: mangled remains of cars, rickshaws, and tuk-tuks. Blood stains could still be seen on the road. Some vehicles were charred beyond recognition.

Ram Singh, who drives a small vehicle to ferry goods from stockrooms to shops in the area, voiced concerns about his livelihood in the aftermath of the explosion.

I hope a sense of security soon returns. I hope the police will be able to restore trust fairly quickly, he said.