YUMA, Ariz. (AP) – Six people, including four children, were killed at a home in western Arizona, authorities said Saturday.

Police discovered a woman and the children dead inside the home after responding to a call about shots fired late Friday. The children, a girl and three boys, were ages 6 to 12. It was not immediately clear how they died.

A man was found in the back yard with a gunshot wound. He later died at a hospital, authorities said.

Police were looking for a man seen running from the house after the shots were fired. Investigators did not immediately comment on a possible motive for the slayings.