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.

One of the four victims was a 36-year-old NYPD officer with 3.5 years on the force; the other three were civilians.

Police say a man in South Ozone Park, Queens, dragged a motionless dog down the street before setting it on fire.

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