After the siege began, government agents began a psychological campaign aimed at convincing those inside the Mt. Carmel building to surrender. They also cleared a large area around the edifice, and this meant the destruction (by tanks and gunfire) or disappearance of several of the vehicles owned by the residents. This is one important area of controversy.
This photo shows an agent posing on a captured Branch Davidian motorcycle. Note the painting on the bike's gas tank, which depicts a six-winged guitar-playing long-tailed seraph and the words 'Rock 'n' Roll'. (I believe that the Branch Davidian flag is illustrated with a six-winged dragon or serpent.)