AUBURN — For the second time in six weeks, graves were damaged at the Worcester Hebrew Cemetery, and police are looking for the culprits.

Police were called to the cemetery on Cemetery Road earlier this week, after a landscaper discovered on Monday a group of graves and tombstones had been damaged.

A total of 19 headstones were knocked over. Two were cracked in half.

"We did recover some physical evidence that we are processing at this time," Police Chief Andrew J. Sluckis said.

Police said around Memorial Day, eight headstones were knocked over. Chief Sluckis estimated the more recent vandalism caused about $15,000 in damage.

Jordan Robbins, who is the co-chairman of running the cemetery for the Jewish Federation of Central Massachusetts, said he was at the cemetery Friday and didn't see any damage at that time.

The federation is offering a $500 reward for information leading to the arrest and conviction of those responsible.

Police are adding patrols to the cemetery. Surveillance is also being added.

Anyone with information is asked to call Detective Vincent Ross or Officer Jonathan O'Brien at (508) 832-7777.

Contact Scott J. Croteau at scott.croteau@telegram.com. Follow him on Twitter @ScottCroteauTG