NEWPORT, R.I. (WPRI) — Four young boys were injured after part of an abandoned stone structure in Newport collapsed Monday afternoon.

First responders rushed to “The Bells” at Brenton Point State Park following reports of a collapse, according to Rhode Island Department of Environmental Management (DEM) spokesperson Mike Healey.

Healey said the boys, ranging in age from 12 to 16, were injured after the dilapidated building’s roof gave way. It appears one of the boys had climbed onto the roof, which Healey said collapsed under his weight.

The 15-year-old fell roughly 25 feet to the ground, according to Healey, along with a concrete slab that landed on top of two boys standing below.

Healey said three of the boys were rushed to the hospital with serious injuries, while the fourth was treated by first responders.

The ruins of what used to be a carriage house and stable have been surrounded by a chain-link fence for more than a decade. Healey said the crumbling structure was cordoned off due to safety concerns.

WATCH: 12 Sky Drone footage of the collapsed roof (Story continues below.)

Despite the no-trespassing signs, parkgoers still sneak into the structure, which is covered in graffiti and littered with trash.

“The Bells” used to be a grand estate and was first built back in 1876. The building was destroyed by a fire in 1960 and has been in disarray ever since.