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Two people are missing and at least 12 others were injured after two boats collided in the Colorado River at San Bernardino County’s Park Moabi, authorities said Saturday night.

The county’s Fire Department reported the crash shortly before 9 p.m.

Two vessels collided head-on in a stretch of the river near Topock Gorge and Park Moabi Channel, authorities said. The area is not far from the Arizona border.

The force of the crash caused one of the boats to sink; the other sustained heavy damages, according to a tweet from the Fire Department.

Two people are missing and “presumed submerged,” according to the tweet.

At least 12 patients were treated, including one with life-threatening injuries who was airlifted to a Las Vegas-area trauma center. Six people received moderate injuries, while the remaining patients were treated for minor injuries.

Multiple agencies have responded to the scene, including the San Bernardino County Sheriff’s Marine Enforcement Unit, as well as the Mohave County Sheriff’s Office.

No additional information was immediately released.