Law enforcement officials announced Friday that they seized 83 guns, 10,000 rounds of ammunition, and a helmet with a Nazi insignia from the home of a Lexington, Massachusetts man facing civil rights charges, the Boston Globe reported.

Robert Ivarson, 49, was arraigned earlier this week and hit with civil rights and harassment charges for allegedly planting banana peels on the driveway of a black family who lived near the home he shared with his elderly parents, according to the Globe. He now faces 13 new charges related to the weapons arsenal, including 50 pounds of black powder, that investigators say they found in his residence.

These include three counts of possession of a firearm without a license, three counts of possession of ammunition without a license, three counts of possession of a large-capacity firearm, three counts of possession of a large-capacity feeding device, and one count of being an armed career criminal, according to the Globe.

Investigators said at a news conference Friday that he was under video surveillance by Lexington police last week when he allegedly threw banana peels onto his neighbor’s property on three consecutive days last week, the Globe reported.

CBS reported that Ivarson was ordered held on $10,000 bail and made to wear a GPS monitoring bracelet and stay under house arrest for the hate crime charges. He will be arraigned on the additional weapons charges on Monday.