DURHAM, N.C. -- Three of the Duke University chapel's famous stained glass windows were broken during the last day of classes celebration when hundreds of students packed the lawn for several hours of games and entertainment. University officials said windows damaged Wednesday were 30 feet off the ground and may have been targeted by someone throwing rocks. The holes were five to 10 inches in diameter. The windows depict the magi on their way to Bethlehem, Jesus on a pinnacle and the Transfiguration. Chapel dean Sam Wells said it's not clear why the windows were broken. He says there is little security around the building.