Delhi-Mumbai parallel: July 13 blasts too had PETN

While the Delhi bomb is believed to have had PETN in large quantities,only traces of it were found in the analysis after the 13/7 blasts in Mumbai,sources said. The use of the chemical also indicates a possible military background armies around the world have used PETN for long,they added.

The Delhi bomb was,in forensic parlance,of the first order,as the explosion fully consumed the chemicals,the batteries and the carrier in which it was placed. This,sources said,was a signature of the Lashkar-e-Toiba.

It was not known until now that the Mumbai bombs had traces of PETN. Forensic experts had only mentioned ammonium nitrate and fuel oil besides a nitro compound which they now say is PETN.