Federal prosecutors have filed an additional charge against Cole Allen, the suspect accused of attempting to assassinate former President Donald Trump, related to an incident involving a Secret Service officer at a Washington, D.C., security checkpoint last month. The new charge, brought by a grand jury in Washington on Tuesday, accuses Allen, 31, of assaulting a Secret Service officer with a shotgun during an attempted breach outside the White House Correspondents’ Association dinner.

The indictment adds to three other charges already facing Allen, including attempted assassination of Trump and firearms offenses, such as discharging a weapon during a crime of violence. Allen was arrested at the Washington Hilton hotel following the attack, which occurred amid the high-profile event attended by Trump administration officials, including Acting Attorney General Todd Blanche.

Blanche, who was present during the dinner, described Allen as “heavily armed” and said the suspect “rushed security and shot a Secret Service officer in an attempt to assassinate President Trump,” noting that law enforcement’s quick response prevented further harm. The incident has been the subject of some confusion, particularly regarding who fired the shot that struck the officer’s protective vest.

Last week, U.S. Attorney Jeanine Pirro clarified on social media that federal authorities have found no evidence suggesting the bullet that hit the agent came from friendly fire. Secret Service Director Sean Curran echoed this position during a Fox News interview, stating that all available evidence indicates Allen fired the shotgun at the officer at point-blank range. Curran praised the officer’s actions, noting that despite being shot in the chest, the agent was able to return fire and wound the suspect.

Allen appeared in federal court for a hearing on Monday before Magistrate Judge Zia Faruqui. During the proceedings, Judge Faruqui expressed concern over Allen’s treatment while in custody, including time spent under suicide watch and in a padded cell with continuous lighting. The judge apologized for what he described as troubling jail conditions.

The investigation into the attempted assassination continues as authorities build their case against Allen, who remains in custody pending trial.