7 Jul 2017 03:22 AM EST

Officials on Thursday announced that the New York Police Department was adding ballistic protection to all 72 of the vehicles in its fleet. The announcement comes a day after a bullet blasted through a passenger window of an RV-like command post and killed a police officer sitting inside.The mobile command centers hadn't originally been part of a plan to retrofit all of the department's squad cars with inch-thick bullet-resistant glass and armored door panels capable of stopping a round from a .44 Magnum. The additions are in response to the killing of two officers in 2014.