Singh then walked through four coaches without using his weapon until he came across a passenger in the pantry car, identified as Sadar Mohammed Hussain, and killed him, Among those killed was an assistant sub-inspector (ASI) and three passengers – all Muslim men with beards – across nine carriages. Four casualties, including the ASI, have been reported in the firing incident inside the Jaipur Express train (12956).The accused has been arrested. DCP North GRP has been informed,” ANI quoted the RPF as saying.The accused RPF constable has been identified as Chetan Singh.