Millions of Americans in US state plunged into mourning as gov orders all flags to fly half-staff after horror shooting

MILLIONS of Americans have been plunged into a period of official mourning following a fatal shooting.Pennsylvania Governor Josh Shapiro ordered all US and state flags to be lowered to half-staff on Saturday.The order came after Philadelphia Police Officer and father of two Shane Seiber was shot and killed while responding to reports of an armed man at 12:20am on Saturday.