GILLETTE, Wyo. (AP) — Firefighters in the northeast Wyoming city of Gillette successfully freed a 12-year-old boy who had become trapped under large landscaping boulders.

Capt. Bryan Borgialli of the Campbell County Fire Department says they were called to a home at about 7:50 p.m. Tuesday and worked about 40 minutes to free the boy, who was not hurt.

He says the boy had been playing underneath some rocks when two rocks shifted, pinning him to the ground by his chest and head.

Borgialli estimated that one of the rocks weighed between 750 and 1,000 pounds, while another weighed about 1,500 to 2,000 pounds.

He says firefighters used the Jaws of Life, chains, air hammers, high-pressure air bags and a lot of caution to free the boy.