The New York City office building that was the site of a mass shooting Monday had significant security measures in place. There was an off-duty police officer present, along with other security ...

The deadly shooting at 345 Park Avenue in July rattled Manhattan’s office world, and also caused owners to think twice about their current security protocols. On July 28, a gunman killed four people ...

Add Yahoo as a preferred source to see more of our stories on Google. This is the photo shared by law enforcement of the man they believe to be the gunman walking into the building. - Obtained by CNN ...