University police posted an advisory Monday saying two students reported being approached by two men who asked for a light for a cigarette.
Police also said Williams had been arrested on a charge of carrying a pistol without a permit a day before his arrest on the robbery charges. Tuscaloosa police Sgt. Brent Blankley said in a news release that a clerk at a gas station called police early Sunday, telling officers that Williams threatened that he had something in his trunk after a fight about paying for gas.
Officers who pulled over Williams found a pistol in his pants pocket, the release said. In that case, he was released on $500 bond.
Jail records did not show whether any of the players had an attorney.
Pettway, who was a redshirt freshman, played in 13 games and had 2 1/2 sacks and eight tackles.
Hayes had 14 tackles as a freshman.
Calloway played mostly on special teams but gained 63 yards on 10 carries. He has moved around on the field, working as a linebacker, tight end and H-back since Alabama signed the onetime Auburn commitment.
Calloway was arrested on a charge of marijuana possession in October 2011 during a redshirt season.