Researchers study costs of 'dirty bomb' attack in L.A.

A dirty bomb attack centered on downtown Los Angeles' financial district could severely impact the region's economy to the tune of nearly $16 billion, fueled primarily by psychological effects that could persist for a decade.

Pacaya volcano erupts in Guatemala

Guatamala's Pacaya volcano erupted early Thursday, sending volcanic material more than 400 meters in the air, authorities said.

Oil spill threatens rare Bangladesh dolphin breeding zone

An oil spill on a river in southeast Bangladesh has threatened the breeding ground of the critically endangered Ganges dolphin, environmentalists said Sunday, describing it as a "major disaster" for the mammal.

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