The NYPD Hate Crime Task Force is investigating vandalism at the Cypress Hills Cemetery.

Cemetery officials say they are working hard to repair the damage that was caused just after midnight.

Police say the three suspects, believed to be between ages 16 and 19, came in to the cemetery and damaged more than 40 headstones -- knocking them over and spray-painting offensive words.

The trio then went into the Abbey mausoleum and broke the marble stones on the fronts of about 15 vaults, while also spraying derogatory words, police say.

The cemetery's chief of operations says all headstones that were knocked down have already been fixed. They are now making additional repairs and getting in touch with the impacted families.

The cemetery usually has security on site until about 8 p.m., but there will now be security in place 24 hours a day.