(CNN) Ohio authorities are looking for a man who stabbed a 7-year-old girl at a school playground in Dayton.

The man walked onto the playground Friday, stabbed the second-grader and fled on foot, police said.

The unidentified victim is being treated for serious injuries at a local children's hospital.

The attack occurred at World of Wonder PreK-8, and prompted the school to be placed on lockdown.

"We don't know if at this point the child was targeted for some reason," said Dayton Police Lt. Eric Henderson.

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