SUNOL -- A bicyclist was airlifted to a hospital with major injuries after falling off a bike in Pleasanton Ridge Regional Park on Monday afternoon, authorities said.

Officers were called about 1 p.m. to Foothill Road in the Alameda County park for a report of a person on a trail who needed medical aid, according to the East Bay Regional Park District Police Department.

The 54-year-old man who fell was taken by helicopter to a hospital to be treated, said park police spokeswoman Emily Hopkins.

Hopkins did not say what type of injuries the man suffered.

Check back for more details.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.