Israel's ambassador to India Ron Malka, meanwhile, said there are enough reasons to believe it was a terrorist attack but they are not surprised at the event as the alert level had been increased for past few weeks following intelligence inputs. According to sources, police questioned some persons, including a few Iranian nationals and a cab driver who dropped two persons near the blast site just before the explosion.
The forensic team has got evidence of the usage of ammonium nitrate for the blast which caused a small trench at the site. Sources have said that if RDX was used then the impact would have been higher. Police have also recovered CCTV footage, a half-burnt pink scarf and an envelope addressed to Israel Ambassador from the blast site.
Earlier, police had recovered an envelope, containing a note, and addressed to the Israeli Embassy, and a half-burnt pink scarf from the site. The envelope that was found at the spot was found around 12 yards away from the blast site and police sources have said the letter was addressed to the Israeli Ambassador. Police is tracing its fingerprints and examining its contents.