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.

A New York City police officer who was among the four people shot and killed by a gunman during a rampage at a Manhattan ...

A somber morning in New York City on Tuesday as the city mourns the loss of four innocent victims, including a veteran NYPD officer, whose lives were claimed during a shooting rampage just hours ...

A 29-year-old man was arrested and charged with attempted murder for setting a Virginia city councilman on fire on Wednesday, in what authorities are saying was an apparent personal attack.

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

A supervisor at the Las Vegas casino where Shane Devon Tamura worked legally purchased the gun used in the Midtown Manhattan shooting and sold it to him for $1,400, a law enforcement official told CNN ...

The gunman who opened fire in a New York City skyscraper, killing four people, including an off-duty cop, bought his $1,400 ...

The attack on a seemingly secure building has rattled workers and prompted managers to examine whether they are adequately ...