A severed hand was found on the roof of a shop near the Red Fort blast site on Thursday morning, police said.
The hand was found a few metres away from the spot of the explosion, behind the Jain Temple, they said.
After being informed about the severed hand, police personnel immediately reached the location, cordoned off the area and collected it.
The severed hand has been sent for forensic examination to ascertain the victim's identity, police said.
Meanwhile, the death toll in the blast rose to 13 after another injured person succumbed to his injuries at the LNJP Hospital in New Delhi, an official said.
The deceased has been identified as Bilal, he said.
According to Delhi Police, information about Bilal's death was received from the hospital early on Thursday morning.
The post-mortem will be conducted later in the day, officials said.
With Bilal's death, the total number of fatalities in the high-intensity explosion on Monday evening has climbed to 13, while several others remain under treatment.
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