The police seized 55 improvised explosive devices, RDX, wrist watch dials and SIM cards.

In August 2019, 19 people including 4 Bangladeshi citizens, members of the Jamaat-ul-Mujahideen Bangladesh (JMB), were convicted of carrying out the attacks by a National Investigation Agency special court.

[3] He was also convicted of plotting to behead foreign tourists in Kolkata by a sessions court, and is suspected of being an Islamic State member and had a history of other violent offences including throwing a shoe at the judge during a previous hearing.

[5] Locals informed the police and the fire brigade when they heard the sound of explosion and saw smoke billowing out of the first floor room.

The police also seized large numbers of wrist watch dials, SIM cards and tools used to prepare improvised explosive devices.

[8] According to the NIA, the Al Jihad module had planned a series of ten blasts in Kolkata during the Durga Puja.