India, April 30 -- A suspected railway track bomber was in contact with a Malaysia-based handler, identified as Jujhar Singh, through the encrypted messaging app 'Threema', according to officials investigating the case.

Punjab Police officials said 'Threema' is a paid, cross-platform encrypted instant messaging app that offers end-to-end encryption. Additionally, it does not require a phone number or email address for registration.

The accused, Jagroop Singh from Panjwar Khurd village Tarn Taran, was killed when an improvised explosive device detonated prematurely during an attempt to target a freight railway track at Bathonia near Shambhu in Patiala on Monday night.

Following the incident, Punjab Police uncovered a Pakistan-linked ter...