A shocking incident unfolded onboard the Jaipur-Mumbai Express on Monday, where an enraged Railway Protection Force (RPF) constable allegedly shot and killed a colleague and three passengers. The tragic event took place between the Virar and Mira Road stations around 5.30 a.m. It was reported that two on-duty RPF constables engaged in a serious altercation, leading one of them to use his firearm and open fire on the other. Tragically, the targeted constable and three passengers, including a woman, lost their lives in the shooting. Authorities, including the police and RPF officials, are currently investigating the incident, and further details are yet to be revealed.