PHOENIX — Two young children are dead and their mother was taken to the hospital in critical condition after an incident at a Phoenix apartment Wednesday evening, authorities said.

Officers responded to the apartment complex near 13th Street and Mountain View Road just before 6 p.m. after a man called 911 saying his two children were dead in the home, Sgt. Andy Williams with the Phoenix Police Department said in a press conference.

Williams said the children were pronounced dead at the scene and a woman was taken to the hospital with obvious signs of trauma.

The cause of the children’s death was unknown as they had no signs of obvious trauma, Williams said.

The man has been detained and is cooperating with investigators, Williams said, adding the man is not being called a suspect at this time.

It is believed the man and a woman are in a domestic relationship and the children belong to them.

The ages of the children were not known.

No additional information was made avaialble.