Israeli police say vandals have defaced graves at a Christian cemetery in Tel Aviv.

Police spokesman Micky Rosenfeld says the words "price tag" were found on Thursday, sprayed on a number of graves in Jaffa, a mixed Arab-Jewish part of the city.

That phrase is usually used by a fringe minority of Jewish extremists to protest what they perceive as the Israeli government's pro-Palestinian policies and retaliation for Palestinian attacks.

Rosenfeld says police are searching for the perpetrators.

Vandals have targeted mosques, churches, dovish Israeli groups and even Israeli military bases with "price tag" graffiti in recent years.

Thursday's incident follows one on a Jerusalem church two weeks ago.