Canterbury, New Hampshire police are trying to figure out who caused damage at the Maple Grove Cemetery.Police say graves were trampled and veteran flags were pulled out of the ground sometime between Aug. 11 and Aug. 14.Investigators said some type of all-terrain vehicle also left tire marks in the cemetery.Justin Spencer, the frontman for the New Hampshire-based band Recycled Percussion, said he will give $10,000 for information that leads to an arrest. Anyone with information is asked to call Canterbury police.