Violent tornadoes hit parts of U.S. as severe storms kill at least 37, unleashing winds and fanning wildfires
Violent tornadoes ripped through parts of the U.S., wiping out schools and toppling semitractor-trailers in several states.
How the U.S. is confronting the threat posed by drones swarming sensitive national security sites
Drones have repeatedly swarmed sensitive military sites. Current and former Air Force generals, along with a senior member of Congress, say the incursions pose a security threat.