PHILADELPHIA (CBS) — Police say an examination on a boy who died early yesterday morning revealed that he suffered a large laceration to his liver, bruising on his chest wall, a bruised ear and an abrasion over his eye.

Authorities say two-year-old Zyair Worrell also tested positive for THC.

Police responded to the scene late Tuesday night following the report of a “hospital case” on the 600 block of E. Clementine Street in Kensington.

Upon arrival, they observed a 23-year-old female holding Zyair, who appeared to be lethargic.

Police say the woman identified herself as his mother. Her 21-year-old boyfriend was also present.

Officers took the child to St. Christopher’s Hospital, where he was pronounced dead.

Police say information regarding an arrest will be released soon.

They say the motivation is child abuse.