GLENDORA ( — Authorities said a 20-year-old Clayton man riding a skateboard on a mountain road in the Angeles National Forest was killed after being hit by a dump truck.

Paramedics were sent to Glendora Mountain Road near East Fork Road shortly after 10 a.m., county fire Inspector Randall Wright said.

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The unidentified victim was pronounced dead at the scene. His name was withheld until his next of kin could be notified.

The roadway was closed while an investigation was conducted by the California Highway Patrol.

KCAL9’s Tom Wait reports the practice of skateboarding at high speeds on the mountain road is a practice called “Hill Bombing.” It’s not new. Pat Harvey reported on the practice back in 2012.

Officials said the deceased was going 20-30 mph on his skateboard at the time of the collision.

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The deceased was wearing safety gear but he failed to remain in his lane and struck the undercarriage of the dump truck, which then ran over him, CHP Officer Rodrigo Jimenez said.

The deceased was hill bombing with two other skateboarders and a van driver. Officials said no charges will be filed against them.

Wait spoke to motorcyclist Thomas Beal, who often rides the windy stretch of Glendora Mountain Road favored by the skateboarders.

“It’s quite a long trek for them,” Beal said. “I just feel like they don’t have any brakes and that at any given moment they could be in peril.”

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