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Ammonium nitrate was again used in Saturday's blast in south Delhi's [Images] Mehrauli area that killed a boy and left nearly two dozen people injured.

Officials said Ammonium nitrate was accompanied with one-and-a-half inch nails, which acted as shrapnel leading to injuries.

The packing of explosive was very loose, thus making it a low-intensity explosion.

The same explosive material was used in the five serial blasts that shook the national capital on September 13, leaving 24 people dead and many others injured.