Federal officials have charged a New York man with manufacturing an explosive device, saying he planned to set off a 200-pound bomb at the National Mall in Washington on Election Day, killing himself and possibly many others.

Paul Rosenfeld, 56, was arrested on Tuesday after the Department of Justice was tipped off by an unidentified person in Pennsylvania who claimed Rosenfeld sent text messages and letters stating that he “planned to build an explosive device” that would go off on Nov. 6 as a way to “draw attention to his political belief in ‘sortation.’”