A Kansas City man who tried unsuccessfully to firebomb an office of U.S. Rep. Emanuel Cleaver was sentenced to 10 years in federal prison with no chance of parole.

Eric King was sentenced Tuesday in federal court for the Sept. 11, 2014, vandalism at Cleaver's congressional office in downtown Kansas City. No one was in the building at the time and two Molotov cocktails did not ignite.

King pleaded guilty in March to using explosive materials to commit arson.

Investigators say King broke an office window with a hammer. One of the firebombs went through the window and another bounced off the side of the building.

Kansas City police had investigated King in connection with several anti-government incidents near the congressional office during the Labor Day weekend in 2014.