Patiala, April 29 -- Police on Tuesday unearthed a pro-Khalistan terror module, backed by Pakistan's ISI and arrested four men following a botched sabotage attempt on the Rajpura-Shambhu railway line on Monday night. The breakthrough came after a suspected bomber, Jagroop Singh of Panjwar Khurd in Tarn Taran district, was killed when his explosive device detonated prematurely during an attempt to target the freight track near Bathonia village. The explosion, which occurred around 10pm on Monday, caused minor damage to the freight rail corridor track and briefly disrupted train movement before services were restored after emergency repairs. It was the second such attempt in the past three months, targeting the freight rail corridor track. Earlier on January 23, a blast on a dedicated freight corridor railway track in Fatehgarh Sahib district's Sirhind had damaged the engine of a train and left its pilot injured. Patiala senior superintendent of police (SSP) Varun Sharma and deputy inspector general (DIG) of police Kuldeep Chahal confirmed that the module, linked to pro-Khalistani elements, was dismantled within 12 hours of the incident. The arrested suspects - Pardeep Singh Khalsa and Kulwinder Singh, both natives of Mansa, Satnam Singh, younger brother of Jagroop, and Gurpreet Singh of Tarn Taran were part of the module and have a criminal past, police said. Investigators identified Khalsa as the kingpin, alleging he maintained active links with handlers in Malaysia and Pakistan to coordinate attacks on public infrastructure. The accused have confessed to the Shambhu detonation and currently face multiple charges under the Bharatiya Nyaya Sanhita (BNS), the Explosive Substances Act, and the Unlawful Activities (Prevention) Act (UAPA). Police are continuing raids to identify further accomplices and prevent future strikes on public property. The investigation shifted from a local sabotage probe to a major counter-terrorism case following the recovery of a SIM card, a mobile phone and wires from the blast site. Subsequent raids led to the seizure of a hand grenade, two .30-bore pistols, ammunition and sophisticated communication equipment used to coordinate with foreign handlers. Officials say the group operated under a radical outfit, named Chalda Vaheer Chakarwarti, Attariye, which facilitated terror training for radicalised youth in Malaysia. DIG Chahal said the blast took place before a coal-laden train on the stretch passed along the stretch. The loco pilot felt some jerk and then he raised the alarm, alerting the authorities, the DIG added. He further said prima facie it appears Jagroop was not alone at the time of planting the explosive. "There was likely another suspect present when the device was being planted," he said, adding that the accomplice is yet to be identified. Chahal confirmed that the explosion was caused by an improvised explosive device (IED) using RDX, but declined to specify how much explosive material was involved. He added that the matter had already been referred to the National Investigation Agency (NIA) for further investigation. A Government Railway Police official said repair work on the track was undertaken and rail traffic has been restored....