Government warplanes bombed a rebel stronghold Saturday, killing a French peacekeeper and injuring 20 other people, and French troops responded by shooting down two military planes and an attack helicopter, U.N. officials said. The violence threatened to drag French and U.N. peacekeepers into Ivory Coast's renewed civil war, sparked when army hardliners Thursday broke a cease-fire after more than a year of relative peace and launched airstrikes on rebel-held cities. The government warplanes struck the northern town of Bouake on Saturday afternoon, killing the French soldier, U.N. mission spokesman Jean Victor Nkolo said. It was not clear whether the 20...