KANSAS CITY (AP) – A federal grand jury has added more charges against a Kansas City man accused of throwing Molotov cocktails at a congressman’s local office.

The U.S. Attorney’s office says the additional charges are included in an indictment returned Tuesday against 28-year-old Eric King.

King is accused of trying to firebomb the Kansas City office of U.S. Rep. Emanuel Cleaver on Sept. 11. Police said a window was broken, but the two alcohol-filled bottles failed to ignite.

King was charged last month with using a dangerous instrument to intimidate and interfere with a federal official. The new charges include attempted arson, using explosive materials to commit a felony and illegally possessing an incendiary device.

King remains held without bond. A call to his public defender was not returned.