Answer based on context:

Coming off of their surprising home win over the Bears, the Lions flew to FedExField for a Week 5 intraconference duel with the Washington Redskins.  Heading into the game, Detroit had never won a game against the Redskins in Washington, D.C. (0-20) After a scoreless first quarter, the Lions trailed as in the second quarter when Redskins QB Jason Campbell completed a 7-yard TD pass to TE Chris Cooley, followed by FB Mike Sellers getting a 1-yard TD run.  In the third quarter, Detroit managed to get on the board with kicker Jason Hanson getting a 39-yard field goal.  However, Washington came right back with DE Andre Carter sacking Lions QB Jon Kitna in the endzone for a safety.  In the fourth quarter, the Redskins sealed Detroit's fate with Campbell completing an 8-yard TD pass to Sellers, kicker Shaun Suisham nailing a 28-yard field goal, and CB Carlos Rogers returning an interception 61 yards for a touchdown. With the loss, not only did the Lions fall to 3-2 heading into their bye week, but lessened their record to 0-21 against the Redskins in Washington, D.C.

How many points did Detroit score in the third quarter?
3