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Investigators in Virginia are looking for the person behind five shootings in the past few weeks at the Pentagon and other military locations -- all, they say, traced to the same weapon. So far, the shooter has attacked when the buildings were mostly empty, and no one's been hurt. The FBI wants to make sure it stays that way.

The National Weather Service posted dozens of flood watches, warnings and advisories across the state.

The National Weather Service posted dozens of flood watches, warnings and advisories across the state.

One in five Sierra Nevada conifers are no longer compatible with the environmental conditions around them, raising questions about how to manage the land. Researchers say it may get worse.

NPR's Lilly Quiroz brings us a postcard from Guatemala about Lake Atitlán, considered to be one of the most beautiful lakes in the world.

For 36 hours, dozens of police, veterinarians and hunters scoured a wooded German suburb while warning residents a lion could be at large. Turns out they may have misjudged a video of the animal.

There's a species of fireflies that synchronizes its lights. It only happens in a few very dark places in Appalachia and it takes winning a lottery to see.

You may not find South Sudan at the top of most dream destination lists, but the authors of a new travel guide say the young country, long isolated by a violent civil war, has much to offer tourists in search of wildlife, culture and natural beauty.

Maoist guerrillas ambushed government troops in India on Tuesday, killing at least 75 paramilitary police in an action that has raised political criticism of government efforts to fight the nearly 45-year-old insurgency.

The Interior Department has announced that it will end federal protections for the Yellowstone grizzly bear.

New Englanders are expecting treacherous roads and power outages. Southern New England and the coastline will get mostly rain, and maybe a few inches of snow, with most snow further north.

It has long been understood that photosynthesis creates oxygen, but researchers believe they've found oxygen being created in parts of the ocean with no light.

Many forests in the American West have evolved with fire, and actually benefit from the occasional wildfire. But researchers are finding that trees that once would survive and thrive with small fires are now losing their ability to do so.

The elderly residents of Wave Crest Gardens in Queens know things could be worse. Their building didn't get washed away, or lose a roof, during Sandy. But they've been without heat and power for a week, and some residents are increasingly worried.

China's secretive military appears to be up to something around Taiwan, but it's unclear whether it's a formal military drill.

The images show a devastating transformation of eastern Spain, where at least 205 people have been killed by flash floods.

A mix of snow and ice blanketed a large swath of the northern U.S. over the weekend, after a major winter storm hit parts of the Upper Midwest, the Great Lakes region and the Northeast.

Mount Etna produced a spectacularly explosive eruption Monday, sending a ripple of reddish clouds down from the southeast summit of Europe's highest active volcano.

Such attacks have become common in north-central Nigeria, where gunmen exploit security lapses to launch deadly raids on farmers in a fight over land resources.

Fast-paced floodwaters in San Antonio left 13 people dead. West Virginia also witnessed at least three deaths from flash flooding, with more people missing.