A Molotov cocktail was hurled at a Jaffa synagogue Saturday evening, as tensions were rising in the central Israel town after two Arab cemeteries were vandalized over the weekend, Yedioth Ahronoth daily reported.The firebomb hit the roof of the synagogue and did not cause significant damage. No injuries were reported in the incident, the daily reported on its website.Police officials arrived at the site and launched an investigation into the attack.Meanwhile, some 150 Jewish and Arab Jaffa residents held an anti-racism rally Saturday night, where speakers issued harsh charges against Israel\'s government and top leaders.Speaking at the event, Knesset Member Jamal Zahalka (Balad) said \"We accuse the government of Israel.\" The Arab MK called for imprisoning Foreign Minister Avigdor Lieberman on charges of incitement. \"These little racists who come and spray paint a few slogans are much less dangerous than this dangerous government,\" he said.\"The distance between racist words and acts is horrifically short,\" Zahalka said, while slamming Shas spiritual leader Rabbi Ovadia Yosef, the settlers, and Lieberman.\"The little racists who burned the mosque in Tuba Zangaria and attacked the cemeteries in Jaffa have spiritual fathers in the government.\" Referring to the string of recent attacks on Arab targets, the Balad MK charged that \"a Jewish underground\" is behind the vandalism spree. Chants at the rally included \"Settler, stop now, you already crossed the line\" and \"Arabs against racism.\" Earlier, some 25 tombstones were vandalized at two Jaffa cemeteries belonging to Muslims and Christians. The messages \"Death to Arabs\" and \"Price tag\" were spray painted on the graves.