Patiala : A railway staffer was injured and a freight engine and railway track were damaged in an explosion in a freight corridor near Sirhind in Punjab’s Fatehgarh Sahib district on Friday night, following which a pro-Khalistan group claimed responsibility for the incident, officials said on Saturday. Punjab freight corridor explosion: staffer hurt, Khalistan group issues claim (ANI ) The Khalistan Zindabaad Force (KLF), in a statement issued by Ranjit Singh Jammu, claimed responsibility and said the explosion was carried out on the 40th anniversary of the declaration of Khalistan to “remind the Indian government that the fight for Khalistan was still alive and would continue.” A senior police officer, privy to the investigation, said, “Our teams are already investigating the case. NIA has also joined the probe. We informed all central agencies, including the NIA, soon after the incident.” Also Read | In Punjab train track blast, a Khalistani link under lens after viral letter says ‘this was just a trailer’ Deputy inspector general (DIG), Ropar Range, Dr Nanak Singh said the blast occurred …