U.S. Attorney Jeanine Pirro confirmed that the bullet that struck a Secret Service agent at the White House Correspondents' dinner came from suspect Cole Tomas Allen's shotgun.
- Buckshot pellet found intertwined with agent's vest fiber. - Agent fired five times but did not hit Allen.
- Allen faces assassination and firearm charges; grand jury on May 8. - Lawyers seek removal from suicide precautions; hearing May 4.
The case continues to develop as prosecutors gather evidence.