Guatemala's Constitutional Court on Monday struck down the 80-year sentence given to former dictator Efrain Rios Montt as well as his conviction for genocide and war crimes. The 3-2 ruling annulled all proceedings that took place after the trial was temporarily halted on April 19 due to a technicality, overturning the May 10 conviction but leaving most of the trial and testimony intact. It was not immediately clear whether the proceedings from April 19 could be repeated, nor whether Rios Montt, 86, would remain in prison.

WASHINGTON - A new government report details 87 shipwrecks that could pollute U.S. waters with oil. Most were sunk during World War II. The potential for pollution is less than scientists had expected. They estimate that far less oil will leak into the ocean than the BP oil spill of 2010, which spewed roughly 200 million gallons into the Gulf of Mexico alone. However, six leaks are considered potentially significant coastal pollution problems. Study author Lisa Symons said Monday those six keep her up at night. Five are off the Florida coast, one just 15 miles from shore.

A powerful tornado swept through an Oklahoma City suburb on Monday, tearing down blocks of homes, two schools and leaving at least 51 people dead, including 20 children, local officials said. The state medical examiner's office released the latest death toll but the number was climbing rapidly, as emergency crews combed through smashed homes and the collapsed remains of an elementary school in Moore, Oklahoma.

SEOUL, May 21 (Yonhap) -- South Korea was ranked the worst country at preparing policies to meet challenges posed by aging, a state-run think tank said Tuesday, in the latest wakeup call that the Asian country needs to take action to deal with its rapidly aging population. South Korea is fast becoming an aged society, in which more than 14 percent of the population is 65 or older. Korea became an aging society in 2000, when the ratio exceeded 7 percent.