The bomb that went off outside the Israeli embassy on January 29 was not a crude device. Investigators have found that it was triggered by a local module using a remote and could have been put together using the deadly PETN or ANFO. The final lab reports are awaited.

More than a month after an improvised explosive device (IED) went off outside the Israel embassy in Delhi late January, India’s central counterterrorism agencies have drawn up a list of suspects, with their investigations concluding that the Iranian Quds force was behind the terror plot but that the bomb was planted by a local Indian Shia module, according to people aware of the developments.

https://www.hindustantimes.com/india-news/iran-guided-israeli-embassy-blast-through-local-module-upsets-india-officials-101615166916562.html