Riot police fired tear gas and water cannons in clashes with stone-throwing youths during a protest on Sunday in Geneva against the G7 group of wealthy nations. It comes a day before G7 leaders including U.S. President Donald Trump hold a summit in nearby France. Environmentalists, women's rights advocates and pro-Palestinian activists led the way. Police said roughly 20,000 protesters overall included 600 “Black Bloc” militants. Swiss and French authorities have deployed thousands of police for the summit starting Monday. Activists have expressed frustration with Trump and other G7 leaders over various issues.