MARYLAND HEIGHTS, Mo. – Ambulances were dispatched to an area near Westport Plaza in Maryland Heights after multiple people were stabbed Thursday night.

The incident occurred just after 8:20 p.m. in the 12000 block of Marine Avenue.

One adult man and one child under the age of 5 were killed. One adult woman and a child under the age of 5 were rushed to a local hospital with serious injuries.

Investigators described the incident as a domestic situation involving a single family.

Police said the suspect, who is related to the victims, remains at large.