Police opened an investigation into suspected vandalism at a Jewish cemetery in a Philadelphia neighborhood where headstones were found knocked over.

A groundskeeper discovered the damage at the Adath Jushurun Cemetery in Frankford in the early afternoon on Tuesday.

According to police, cited by the local ABC affiliate in Philadelphia, at least five headstones were affected. Authorities said an investigation has been launched but did not release furtehr details.

In February, about 175 headstones at the Mount Carmel Cemetery in Wissinoming, a Philly suburb, were toppled and damaged.

The restoration of those gravesites began last month, with the help of volunteers and laborers.

The work will include setting and gluing the stones, fixing the cemetery fence and increasing the lighting for security purposes.

Earlier in February, some 154 gravestones at the Chesed Shel Emeth Jewish cemetery in St. Louis were vandalized.