Bills sign offensive linemen Caldwell, Hills

The Buffalo Bills have signed offensive linemen Antoine Caldwell and Tony Hills hours before opening training camp.

Caldwell is listed at 6-foot-3 and 315 pounds and was chosen by Houston in the third round of the 2009 draft out of Alabama. He had 19 starts in 39 games in four seasons with the Texans.

Hills is a tackle, who was selected by Pittsburgh in the fourth round of the 2008 draft. He's appeared in 11 games during a career split between the Steelers, Denver and Indianapolis.

The moves were announced Sunday, shortly before the Bills' first practice in suburban Rochester. The additions come a day after Buffalo cut offensive lineman Chris Scott. The Bills open camp with injured tackle Chris Hairston on the physically unable to perform list.