The California Highway Patrol's incident logs reported that the off-road crash occurred in the Middle Creek area near Deer Valley Road just after 3 p.m. Sunday.
At least one of the riders had suffered major injuries, including a broken bone.
On Sunday evening, the CHP's Ukiah Dispatch Center has no further information on the crash or the individuals involved.
E-mail Elizabeth Larson at This email address is being protected from spambots. You need JavaScript enabled to view it..
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