The nearly two-week conference comes amid a state of emergency in France imposed after the Nov. 13 Paris attacks that bans marches.
Thousands of demonstrators gathered in central Paris and formed a human chain along the route of a long-planned protest march that was banned by France's Socialist government in a security crackdown following the Paris attacks that killed 130 people.
. An environmentalist attends a protest at the Place de la Republique.
The Paris police chief said that at least 100 people were detained after several hundred people, some masked and armed with projectiles, tried to force their way through a blockade at the Place de la Republique.
Michel Cadot told reporters that police identified 200 or 300 people who violated a ban on protests under the country's state of emergency. Cadot said that the group lobbed glass bottles and other projectiles, including candles set out in homage of the 130 victims of extremist attacks. Shoes laid out at a peaceful protest earlier meant to symbolize the inability to march also were tossed about.
Prime Minister Manuel Valls denounced the violence against police in a tweet, saying that respecting the square, used to pay homage to attack victims, “is to respect the memory of victims.”
It was not immediately clear if those involved in the violence were from a specific group. A known climate pressure group, 350.org, said the protesters were “unaffiliated with the climate movement and broke “the non-violent pledge that every group involved in the climate coalition” signed off on.
. Demonstrators clash with police near the Place de la Republique.
. French riot police apprehend a protester during clashes. Police fired gas at some demonstrators as they tried to reach the square and used tear gas to disperse others.
. Police fight with activists on the candles and flowers set in memory of the victims of the Paris attacks at the Place de la Republique. The site has become a gathering place for Parisiens since the attacks in the capital on Nov. 13
. A protester holds a sign during confrontations with police.
. Riot police try to disperse demonstrators near the Place de la Republique.
. Protesters clash with riot police during a rally against global warming.
More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming.
Thousands gathered peacefully earlier, at the square to lay down empty shoes and in a human chain along a boulevard where protesters had planned to march, site of some of the attacks.
. A couple kisses in front of riot police during protests.