After a gunman opened fire in a New York City office building and killed four people, experts share strategies for workplaces to implement to mitigate acts of violence.

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 officers,

Businesses across the U.S. are reevaluating security after a shooting at a New York City office building raised concerns about workplace safety