Police have identified the man who they say entered a Midtown Manhattan office building wearing body armor and opened fire, killing four people with a high-powered rifle, as Shane Devon Tamura.The 27-year-old recently lived in Las Vegas,

Police are still working to understand the motive of a 27-year-old Nevada man who opened fire at a midtown Manhattan skyscraper and killed at least four people before shooting himself.

“According to our law enforcement partners in Las Vegas, Mr. Tamura has a documented mental health history,” Tisch said.