With Palmer's backing, Hoover warned the nation to expect the worst: assassinations, bombings, and general strikes. Palmer issued his own warning on April 29, 1920, claiming to have a "list of marked men" and said domestic radicals were "in direct connection and unison" with European counterparts with disruptions planned for the same day there. Newspapers headlined his words: "Terror Reign by Radicals, says Palmer" and "Nation-wide Uprising on Saturday." Localities prepared their police forces and some states mobilized their militias. New York City's 11,000-man police force worked for 32 hours straight. Boston police mounted machine guns on automobiles and positioned them around the city.