French anti-gay marriage protesters clash with police in Paris French anti-gay marriage activists dressed as Marianne, the symbol of the French republic, demonstrate in Paris. Photograph: Michel Euler/AP Paris riot police fought back crowds who pushed their way on to Paris' Champs-Elysées avenue as part of a huge protest against a draft law allowing same-sex couples to marry and adopt children. Hundreds of thousands of people - conservative activists, children, retirees, priests - many bussed in from the French provinces - converged on the capital on Sunday in a last-ditch bid to stop the bill. The lower house of France's parliament approved the "marriage for everyone" bill last month with a large majority, and it now faces a vote in the Senate next month. Both houses are dominated by President François Hollande's Socialist party and its allies. Sustained protests led by opposition conservatives in this traditionally Catholic country have eroded support for the draft law in recent months, and organisers hope Sunday's march will weigh on the Senate debate. The first few hours of the protest were peaceful. But as it was meant to be winding down, about 100 youths tried to push past police barricades on to the Champs-Elysées. In an indication of the sensitivity of the issue, protesters had been barred from marching on the avenue that cuts through central Paris and draws throngs of tourists daily.. Police officers wrangled with the youths, firing teargas to force them back. Gaining momentum, more and more protesters took side streets to reach the avenue, blocking a key intersection on the route to the president's Elysée Palace. Police fired more teargas but were unable to block the crowds from spilling on to the road. "Hollande, Resignation!" the protestors chanted, before breaking into the French anthem, La Marseillaise. An official with the Paris police headquarters said two people were arrested and no injuries were reported. The police official was not authorised to be publicly named in accordance with police policy. The official estimated that 300,000 people took part in Sunday's march, slightly less than a similar march in January. Organisers estimated more than 1.2 million people took part in Sunday's march, more than in the January protest. Polls indicate a shrinking majority of French voters back gay marriage, which is legal in about a dozen mostly European nations and some US states. But polls show French voters are less enthusiastic about adoption by same-sex couples. Frigide Barjot, the stage name of an activist who has led protests against the bill, insisted the anti-gay marriage movement wasn't a lost cause. It's the second round, sir. It's not the last battle. Associated Press writer Angela Charlton and photographer Michel Euler in Paris contributed to this report.