COUNCIL BLUFFS, Iowa — Police say a 3-month-old Council Bluffs boy has died after his mother rolled over on top of him while sleeping.

Council Bluffs police say emergency crews were called to the house Sunday morning but efforts to revive the child were unsuccessful.

The child’s mother told officers that she fell asleep on the couch with the baby.

Police say a preliminary autopsy on Monday showed no signs of trauma.

The investigation is continuing and the case if being reviewed by the Pottawattamie County attorney’s office.