A Jewish cemetery in the north-eastern Hungarian city of Gyongyos has been vandalised and human remains from the graves scattered in the area.
The leader of the local Jewish community, Peter Weisz, said that the attack was "unprecedented".
He told reporters that around 20 graves had been vandalised.
The office of Prime Minister Viktor Orban condemned the "barbaric deed" and pledged to renovate neglected cemeteries in Hungary.
Mr Weisz said that several graves, which date to the late 1800s, held ancestors of the 80 current members of the recently re-established Jewish community in Gyongyos.