Cole Tomas Allen, a 31-year-old accused of opening fire at the White House correspondent's dinner, is set to appear in federal court in Washington, DC. Here are 5 key things to know:
1. Chilling Attack Authorities say Allen allegedly opened fire as he tried to enter the ballroom at the Washington Hilton, where President Donald Trump and senior officials were gathered. One officer was hit, but his bulletproof vest saved him.
2. Allen's Background He is an engineer, game developer, and teacher, with a bachelor's degree in mechanical engineering and a master's degree in computer science. His professor described him as a 'very good student' who was 'soft spoken and very polite.'
3. Manifesto and Warning Signs Authorities found a written manifesto in which Allen described himself as a 'Friendly Federal Assassin' and criticized actions taken by the US government. He had also shared his writings with family members and practiced at shooting ranges.
4. Charges and Investigation Allen is facing two counts of using a firearm during a violent crime and one count of assault on a federal officer with a dangerous weapon. More charges could be added after today's court appearance.
5. Acting Attorney General's Statement Acting Attorney General Todd Blanche said more charges will depend on what investigators find about Allen's motive and planning.
