Police are investigating the fatal double stabbing of a couple in Brooklyn.

Officers found the victims Tuesday inside their apartment located at 1480 Flatbush Avenue.

Neighbors say they heard fighting before it happened.

"My sister did smell smoke, but I just heard a commotion like people talking and yelling, but that's all I heard. Every day I just saw the mom depressed. She just looked really sad so I thought there would be a problem," said one neighbor at the scene.

There have been no arrests.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-8477, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.