The gunman who killed four people at an office building in New York City on Monday evening left his home in Las Vegas, Nevada ...

NBC News’ Jacob Soboroff observed masked federal agents apprehending people who were attending mandatory immigration court hearings.

Officials have confirmed that two girls and an adult missing since a massive explosion at a Nebraska biofuels plant are dead.

Security experts say large businesses may look to fortify their offices by adopting tools and protocols already in place at ...