The U.S. CDC has tightened security following an attack Friday on its Atlanta headquarters that left a police officer and the gunman dead, including having employees work from home on Monday and removing vehicle decals showing where they work.

A police officer killed by an active shooter in Atlanta, Georgia on Friday spent part of his childhood in Massachusetts, the New York Times reported.

Police in Atlanta say the suspect is dead after a shooting near Emory University and the Centers for Disease Control and Prevention headquarters.