A California man allegedly struck and injured four cyclists with a pickup truck—and then fled the scene—during the annual Jesie Gran Fondo charity ride in Marin County on Saturday. But with the help of a GoPro and social media, local cyclists and other concerned community members helped police identify and arrest the driver.

According to witnesses, a blue Dodge Ram swerved and struck the cyclists as they rode single-file on the right side of the road. Some witnesses told police that the maneuver appeared to be intentional.

"It's a horrendous event," said California Highway Patrol Officer Andrew Barclay, himself a cyclist. "Seeing this occur is terrible."

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One rider, having been thrown off his bike and into a ditch, was airlifted from the scene with severe head and eye trauma. The other three were taken to a local hospital with injuries like concussions and road rashes. All four are in stable condition.

While the driver fled the scene, he didn't stay at large for very long. A motorcyclist traveling in the opposite direction reportedly caught the truck on a GoPro camera seconds after the crash. California Highway Patrol released screenshots from the footage along with a call for help from the public. Cyclists and Marin County locals spread the images on social media, and tips flooded in.

Authorities identified and arrested 21-year-old Aaron Paff, of Navato, California, around midnight on Saturday after tracking down his pickup. He is currently being held on charges of felony hit-and-run causing injury.

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Barclay said it's too early to conclude if the crash was intentional, adding that his department is working with the local district attorney's office to determine whether to bring forward additional charges.

"If it was intentional, it's inexcusable and it's a terrible thing to do and a lot of people are angry about it and I would say deservedly so," he said.

Jim Elias is executive director of the Marin County Bicycle Coalition, which hosted the event. He applauded the motorcyclist who came forward with the video and credited the bike community for coming together to help track down the suspect and support the victims.

"This reminds us of the importance of these days riding with cameras," Elias said. "I feel like it’s due diligence."

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