PARIS, July 26 (Reuters) - Pro-Palestinian protesters clashed with police in central Paris on Saturday when hundreds of marchers defied a ban by French authorities to rally against Israel's offensive in the Gaza Strip.
French interior minister Bernard Cazeneuve warned organisers in a television address that they would be held responsible for any clashes and could be prosecuted for ignoring a ban that was confirmed by the country's top administrative court.
TV footage showed a minority of demonstrators wearing balaclavas and traditional Arab keffiyeh headdresses throwing projectiles at riot officers. Paris police said they had made 40 arrests.
French authorities have refused to permit several pro-Palestinian protests because they feared violence. Marchers clashed with riot police in and around Paris in recent weeks, with some targeting synagogues and Jewish shops.
"Anti-Semitic violence exists: we must face it head on," Cazeneuve said.
Some protesters, NGOs and even ruling Socialist politicians have criticised the bans on the rallies as counter-productive.
Cazeneuve noted that over the last two weeks, five marches had been banned, out of about 300 such protests across the country.
"Freedom of protest was thus the rule, and bans the exception," he said.
According to the interior ministry, some 2,000 police were sent to the Place de la Republique to surround the demonstrators, which Reuters photographers estimated numbered between 800 and 900.
The photographers saw one police officer slightly injured, the front windows of the Crowne Plaza hotel smashed and a bus shelter wrecked.
Organisers denied accusations of anti-Semitism.
"Our goal is not to attack the Jews, it is to condemn the policies of a government," Tarek Ben Hiba, a local politician and head of one of the 20 associations organising the protest told Reuters.
Protesters were seen waiving Palestinian flags, chanting "We are all Palestinians" and carrying placards reading: "Zionists, terrorists". At least one Israeli flag was burned, a Reuters photographer said.
In the Mediterranean port city of Marseilles, some 2,000 people marched peacefully on Saturday in an authorised demonstration.
France has both the largest Jewish and Muslim populations in Europe and flare-ups in the Middle East have often in the past added to tensions between the two communities.
Israel began its offensive earlier this month, citing a surge in rocket attacks launched from Hamas militants in Gaza.
The Palestinian death toll in the Gaza Strip on Saturday climbed to 1,000, most of them civilians. Thirty-five Israeli soldiers and three civilians have also died.
U.S. Secretary of State John Kerry met counterparts from Europe, Qatar and Turkey - prime interlocutors with Hamas - at French-hosted talks in Paris.
They called on Israel and Hamas to extend their 12-hour ceasefire in a bid to win time and discuss each side's grievances. (Reporting by Emmanuel Jarry, Benoit Tessier, Gonzalo Fuentes in Paris, Francois Revilla in Marseille; Writing by Michel Rose; Editing by Toby Chopra)
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