(O’FALLON, Mo., AP) — Police in the St. Louis suburb of O’Fallon are searching for a man who stabbed a boy that was part of a group playing touch football in the street.

The attack happened Thursday night in a mobile home park. Authorities say the 13-year-old victim was approached by a stranger who suddenly stabbed him in the neck, then ran away.

The boy is hospitalized in stable condition and expected to make a full recovery.

Authorities don’t know what may have motivated the attack.