A child suffered minor injuries when an "acid-type" device detonated in a park south of Denver, the Douglas County Sheriff's Office said Tuesday.
Five children, whose ages were not disclosed, found the device around 2 p.m. in Dad Clark Park, said Ron Hanavan, spokesman for the sheriff's office.
One of the children picked up the device and it detonated, Hanavan said.
The device, which had a glass casing, exploded in the child's face, CBS Denver reported.
The victim, who was described only as a "young child," was transported to a hospital, but Hanavan declined to give specifics about injuries.
The contents of the device are still being examined. Hanavan said it was an "acid-type" device.
"We believe this was an isolated incident, but we are checking other parks for additional devices," Hanavan said.
Dad Clark Park is about 20 miles south of Denver.