A long-time office cleaner said she encountered the suspected in a mass shooting in a Midtown Manhattan office building.

It's a point borne out by recent research from ASIS International, a global organization of security professionals, that showed 14% of companies had no comprehensive plan to address active-assailant ...

Officials said the gunman fatally shot himself after his attack, which set off a chaotic scene that rippled out into the ...

New York Police Department detectives searched Shane Tamura’s studio apartment in Las Vegas and found several medications, ...

Then officials say the suspect then got into the elevator and headed to the 33rd floor, the headquarters of Rudin Management.

"It was heartbreaking, shock, still in disbelief," said Walter Roby, the former assistant football coach at Granada Hills ...

NEW YORK -- A 27-year-old man wearing body armor and carrying an M4 assault rifle shot and killed four people, including ...

Five people—including the suspected perpetrator Devon Tamura and NYPD officer Didarul Islam—were left dead at an office ...

As investigators continue looking into a possible motive for the man who shot and killed four people in New York City, News 3 ...

The gunman who killed four people, including an NYPD officer, inside a Manhattan office building Monday evening left a note ...