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SIOUX FALLS, South Dakota (Reuters) - Hillary Clinton mentioned the June 1968 assassination of Robert Kennedy in explaining on Friday why she had resisted calls to end her White House bid, drawing a rebuke from Democratic front-runner Barack Obama's campaign.

MONTERREY, Mexico (Reuters) - Suspected drug hit men dumped four human heads in ice chests in northern Mexico on Friday in a gruesome killing of rivals, a state attorney general's office said.

BRASILIA (Reuters) - Twelve South American countries founded a union on Friday aimed at boosting economic integration and political cohesion, but the region's bitter rivalries stymied ambitious plans on defense and trade.

SIOUX FALLS, South Dakota (Reuters) - Hillary Clinton mentioned the June 1968 assassination of Robert Kennedy in explaining on Friday why she had resisted calls to end her White House bid, drawing a rebuke from Democratic front-runner Barack Obama's campaign.

WASHINGTON (Reuters) - Republican presidential candidate John McCain's wife, Cindy, released her 2006 tax return under pressure on Friday, showing she paid $1.7 million in taxes on about $6 million in income.

NAPLES (Reuters) - Police clashed with demonstrators in Naples on Friday night after the Italian government vowed to force open rubbish dumps against locals' wishes in a determined effort to end the city's chronic trash problem.

MONTERREY, Mexico (Reuters) - Suspected drug hitmen dumped four human heads in ice chests in northern Mexico on Friday in a gruesome murder of rivals, a state attorney general's office said.

WASHINGTON (Reuters) - Democratic presidential front-runner Barack Obama, in a letter released on Friday, urged President George W. Bush not to submit a "badly flawed" free trade agreement with South Korea to Congress for a vote.

UNITED NATIONS (Reuters) - The Central African Republic has been hit by an upsurge in attacks by armed bandits, with up to 100,000 people forced out of their homes fleeing such attacks, the United Nations said on Friday.

WASHINGTON (Reuters) - Military officers who denounce policies they helped implement are "cowardly," the top U.S. officer charged on Friday in an apparent reference to retired generals' attacks on Iraq war policy.

DUBLIN (Reuters) - The United States is trying to bully its allies into weakening a treaty banning cluster bombs, Jody Williams, who won the Nobel Peace Prize for leading a campaign against landmines, said on Friday.

BASRA, Iraq (Reuters) - Iraqi soldiers opened fire to disperse supporters of anti-American cleric Moqtada al-Sadr who were gathering for prayers in Basra on Friday, jeopardizing a fragile peace in the southern city.

UNITED NATIONS (Reuters) - Iran's foreign minister and Syria's ambassador to Sweden are among the officials expected to attend next week's ministerial meeting of the Iraq Compact Annual Review, U.N. officials said on Friday.

SANTIAGO (Reuters) - Heavy rains and flooding that killed five people and displaced thousands in south-central Chile have collapsed road and rail bridges, closed the world's largest underground copper mine and left many in the capital without drinking water, the government said on Friday.

TBILISI (Reuters) - Georgia's main opposition coalition vowed on Friday to boycott the nation's new parliament and hold street protests against an election it says was rigged to hand victory to President Mikheil Saakashvili's party.

WASHINGTON (Reuters) - The top U.S. negotiator with North Korea visits China and Russia next week to brief their officials on multilateral efforts to get North Korea to give up its atomic programs, the U.S. State Department said on Friday.

HAVANA (Reuters) - Cuban leader Fidel Castro blasted Republican presidential candidate John McCain on Friday for his criticism of the Cuban government this week, saying McCain had shown why he finished near the bottom of his class at West Point.

BEIRUT (Reuters) - General Michel Suleiman, set to be elected Lebanon's president on Sunday, has kept the army unified through three years of turmoil that have taken the country to the brink of a new civil war.

COLOMBO (Reuters) - Tamil Tiger rebels said a Sri Lankan military roadside bomb killed 17 civilians on Friday in an ambush in rebel-held territory in the far north.

KHARTOUM (Reuters) - Up to 60 heavily armed men on horseback ambushed a patrol of peacekeepers in Darfur, in a new attack on international forces in Sudan's strife-torn west, the United Nations said on Friday.