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Officials said the embargo was part of "an unprecedented set of sanctions." The United States has already approved a set of similar sanctions that have battered the Iranian economy.

Mitt Romney said witholding the returns was a mistake that served as a distraction leading up to South Carolina.

Meteorologists expect tornadoes, hail and strong winds to move through Alabama, Georgia and Mississippi.

Pinning the blame on Pakistan is "unjustified and unacceptable," the country's military concluded in its report.

The Republican presidential contest moves from small ball to big time in Florida for a Jan. 31 primary in which some 4 million state Republicans are eligible to vote. Nearly half live along the Interstate 4 corridor, the "highway to political heaven" running coast to coast from Tampa to Daytona Beach.

Climate simulations show that massive technological interventions, known as "geoengineering," could protect food crops from some of the damaging effects of global warming. But researchers say local effects are hard to predict, so geoengineering may not be worth the risk.

Homeless people may stand a better chance of improving their health when offered a permanent place to live without a requirement for sobriety, the results from a Seattle center suggest.

The plan called for Syrian President Bashar Assad to leave power and that his deputy lead the formation of a unity government.

The court said that placing GPS device on a suspect's vehicle constitutes a search, meaning a warrant is required.

Bad weather moved across the South Sunday night and into Monday morning. Tornadoes were reported in Alabama, Arkansas and Tennessee. In Alabama, some of the worst damage occurred in areas that had already been hit by heavy storms before.