An Alabama man seemed to be gearing up for mass destruction and murder at the Capitol Building on Wednesday ... at least based on what cops say they discovered in his truck.
Lonnie Coffman has been arrested and charged with possession of destructive devices and carrying an unlicensed gun ... but that doesn't tell the half of it.
According to legal docs -- obtained by TMZ -- Coffman approached cops and told them he was trying to get to his vehicle -- a red pickup -- the same suspicious vehicle they had received calls about.
Cops say he asked them if they found the bombs, and upon searching his truck ... they found 11 mason jars containing an unknown liquid with a golf tee in the top of each jar, cloth rags and lighters. AKA -- Molotov cocktails.
They also discovered one M4 Carbine assault rifle with rifle magazines loaded with ammunition ... and a black handgun on the front passenger seat. Cops say he also had 2 guns in his pockets when he was detained.
According to the docs ... while questioning him, he told them the mason jars contained "melted Styrofoam and gasoline." ATF officers say this mixture has the effect of napalm.
Coffman's been arrested, and cops say -- based on security footage -- he was seen leaving the vehicle parked near the Capitol building on Wednesday morning.
As we've reported ... police have begun rounding up and arrested other rioters, including Richard Barnett -- the Arkansan man who was photographed with his foot up on Nancy Pelosi's desk.