ALEXANDRIA, Va. — Two supervisors at the Virginia Department of Transportation and four others have been arrested in what prosecutors say was a $9 million bribe scheme to receive snow-removal contracts.

Federal prosecutors in Alexandria announced bribery charges Thursday against 54-year-old Anthony Willie of Culpeper and 41-year-old Kenneth Adams of Fairfax. The two worked as supervisors in VDOT’s Burke area headquarters.

According to a 40-count indictment, the two awarded about $9.1 million in snow removal contracts to four contractors who agreed to pay bribes equivalent to 5 to 10 percent of the contract value. The scheme allegedly ran for three consecutive snow removal seasons beginning in 2013.

Prosecutors say Willie and Adams received $140,000 in bribes over the course of the scheme.

VDOT officials did not immediately respond to an email seeking comment.