GAZA, Nov 28 (Reuters) - Palestinian militants fired at least one rocket into Israel on Tuesday, breaching a truce that started on Sunday, Palestinian witnesses said. Israeli residents reported the rocket landed near a cemetery in the town of Sderot, close to Israel's frontier with Gaza. Since Sunday's ceasefire took effect, militants have fired at least a dozen rockets into Israel, causing damage but no injuries. This was the first rocket to be fired on Tuesday.