An 18-month-old child accidentally shot and killed his 5-year-old cousin after finding a gun in a Michigan home Wednesday, police said.

Officers responded to a home in Detroit on a call that a child had been shot after 9:30 a.m. the Detroit Free Press reported.

When officers arrived, they found a 5-year-old boy was shot in the neck, according to WXYZ-TV.

The boy was rushed to a local hospital where he was pronounced dead.

“It’s a sad day in the city today,” Police Commander Tiffany Stewart said at a press conference. “We lost another child in the city of Detroit due to a lack of firearm safety. This was completely avoidable.”

Cops say the 18-month-old boy found the firearm in the home and accidentally struck his cousin.

The father of the victim, the boys’ grandmother and another child were in the home at the time of the shooting, police said.

Police arrested the father, who is believed to be the gun owner. No charges were filed pending an investigation.