(JTA) — Gravestones were toppled at a Philadelphia-area cemetery, the second such vandalism in the area this year.

Five headstones were discovered knocked off of their bases at the Adath Jeshurun Cemetery in the Frankford neighborhood of northeastern Philadelphia. The gravestones were not defaced by graffiti, according to the news website Philly.com.

Police reportedly do not have any suspects. The cemetery, which is more than 160 years old, does not have surveillance cameras, though the groundskeeper, who first noticed the vandalism, lives on the premises.

Police told the CBS Philadelphia affiliate that it was clear that the stones were pushed over and did not fall due to age or weather.

In August 2015, at least 124 tombstones were toppled in the same cemetery, where there are only a few new burials a year.

The vandalism comes following the toppling of some 175 headstones at Philadelphia’s Mount Carmel Cemetery in February.