Ware suffered the injury to his right quad and was taken to the locker room, according to Mike Jones of the Washington Post.
Ware joined Cowboys running back DeMarco Murray in the locker room, who was injured moments before Ware. It's unclear at this point whether Ware was taken to the locker room because halftime was approaching or whether it is a sign of a potentially serious injury.
The Cowboys' defense has a much different look without Ware, who is far and away the best pass rusher on the roster. The team often struggles to get much of a push into the backfield whenever he's on the sidelines, and given the Redskins' ability to score points in a hurry behind Robert Griffin III and Alfred Morris, things could get interesting in Dallas if he's unable to return for the second half.