MONTGOMERY, Ala. — Three University of Alabama football players were charged with knocking students unconscious and stealing their wallets, and a fourth player was charged with using a stolen debit card, officials said Tuesday.

Linebacker Tyler Hayes, 18, and safety Eddie Williams, 20, confessed to robbing a student who was punched in the head and face, and kicked in the ribs and back early Monday morning, according to court documents. Williams said D.J. Pettway, 20, a defensive lineman, and Hayes waited in a nearby vehicle about an hour later while he knocked out and robbed another student. Williams and Hayes both admitted to their involvement, according to the documents.

Williams and running back Brent Calloway, 20, both admitted to using a stolen credit card to buy snacks from vending machines inside a dormitory, the documents said.

All four students were indefinitely suspended by Coach Nick Saban.

All four players were backups last season for Alabama, which has won two straight NCAA national titles and three of the past four.