A New York City police officer and three other people were shot and killed inside a Midtown Manhattan office building on Monday evening by a gunman armed with a high-powered rifle, police confirmed.The suspect,

Officials say a man with a rifle killed an off-duty New York City police officer and three other people before taking his own life at a Manhattan office tower.

Authorities say Shane Devon Tamura travelled across the country from Las Vegas to open fire inside the skyscraper.