Nine people were injured, including two young children and their mother, after a shooter opened fire at a splash pad in a Detroit suburb where families gathered to escape the summer heat Saturday. Law enforcement tracked a suspect to a home, where the man died by a self-inflicted gunshot wound, authorities said.

An 8-year-old boy was shot in the head and in critical condition, Oakland County Sheriff Mike Bouchard said during a news conference. The boy’s mother also was in critical condition after being wounded in the abdomen and leg, and his 4-year-old brother was in stable condition with a leg wound. The other six victims, all 30 or older, were in stable condition.