PONTIAC, Mich. (NEWSnet/AP) — Two of the nine people wounded in a weekend shooting at a suburban Detroit splash pad remain hospitalized in critical condition, authorities said Monday.

An 8-year-old boy has "made amazing progress" after being shot in the head, Oakland County Sheriff Mike Bouchard said during a news conference.

The child’s 4-year-old brother was shot in the leg, and the boys’ mother was hit in the abdomen and leg during the random attack in Rochester Hills on Saturday.

Michael Nash, 42, fired as many as 36 times Saturday, stopping several times to reload, police said. He subsequently went home to Shelby Township, where he killed himself.

Nash had no criminal history but apparently suffered privately from “mental health challenges,” Bouchard said.

Bouchard said investigators found at least 11 weapons inside the home, including the handgun they believe Nash used to kill himself. Bouchard said the gunman in 2015 legally purchased the 9 mm handgun used in the violence.

The sheriff said two of the people wounded have been released from the hospital. Another woman who had a wound to her forearm and back may be released later Monday, he said.

A splash pad is a recreational area with a nonslip surface where people can play in fountains and water sprays.

Bouchard said Nash had no connections to the splash pad or any victims.

Investigators still have no information about the gunman’s motive.

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