Cosmetics seller Rajeev Kumar, who owns a shop near the site, has not slept a wink since the blast. He was among the first to respond before ambulances arrived.
"I thought it was a cylinder blast. But when I saw people lying on the road, bleeding, I rushed to help an injured man. He was writing in pain," Kumar said.
On Wednesday, Kumar visited LNJP Hospital to check on the man he had helped into an ambulance.
"I couldn't sleep for the last two nights. I just wanted to know if that man survived. When something like this happens in front of you, it doesn't leave your mind easily," he said.
Ambulance driver Fizaan, who ferried several wounded to the hospital, recalled the horror:
"I carried body parts in my hands. They were shaking," he said.
"There was a loud sound. We did not know what had happened. Sometimes tyres burst and it sounds the same. But when our beat officer told us that there had been an explosion, we rushed straight to Red Fort," he added.
His colleague Imran, who assisted him, said:
"We didn't think much at that time. We just started lifting people. Some were not moving at all, some were crying in pain," he said.
"The smell of smoke and burnt metal was everywhere. Some bodies were severely mutilated," he added.