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FILE PHOTO: Tourist visit monuments atop a ridge held by Union troops, above the field of Pickett’s Charge, Wednesday, June 5, 2013, in Gettysburg. The Pennsylvania Monument is in the distance. (AP Photo/Matt Rourke)

(Gettysburg) — Authorities say a 13-year-old boy from Indiana was flown to a hospital after plummeting about 40 feet from a monument at Gettysburg National Military Park in Adams County.

Acting park spokesman Jason Martz says the Fort Wayne youth was visiting the park on a school field trip when he fell from the Pennsylvania Memorial at about 9:00 a.m. Friday.

The top of the monument has an observation level, and the boy fell from there despite a 3- to 4-foot-high safety wall.

Martz said the youth was flown to Hershey Medical Center with what is believed to be broken bones and internal injuries.

The park has opened an internal investigation.

The 100-foot Pennsylvania Memorial, the park’s largest monument, is in the center of the Union line on Cemetery Ridge.