PITTSFORD, N.Y. (AP) - Defensive end Mario Williams was held out of the Buffalo Bills' first training camp practice because of a sore foot.

Coach Doug Marrone provided few details regarding the nature of the injury. He wouldn't say which foot Williams had hurt or how it happened.

Marrone would only say Sunday night that Williams was held out after the player informed the training staff that his foot was bothering him. Marrone couldn't say how much time Williams might miss because the injury is still being evaluated.

Williams declined comment after practice, and deferred all questions to Marrone.

Williams did not appear to be walking with a limp. He did not participate in any individual or team drills, and spent much of practice watching from the sideline with his helmet on.