NYC crime: 4 people dead, including 2 children, in Upper West Side

Police are looking into four suspicious deaths on the Upper West Side.

Police said they were doing a wellness check on the fourth-floor apartment on West 86th Street around 3 p.m. Monday afternoon.

Once inside, police found four people dead, including two children.

The deceased included a 41-year-old man, a 40-year-old woman, a 3-year-old girl, and a 1-year-old boy.

Officials believe it could be a possible murder-suicide, but the investigation is still underway.

This is a developing story. Stay with FOX 5 NY for more information.