ANAHEIM -- One train rear-ended another on the "California Screamin'" roller coaster at Disney's California Adventure theme park Friday night, slightly injuring 15 people, authorities said.

The accident was reported at 6:39 p.m, according to Anaheim city spokesman John Nicoletti.

"It did not appear to happen at a high rate of speed. Absolutely all of these injuries are minor at this point," Nicoletti told KCAL-TV.

Disneyland Resort spokesman Bob Tucker declined to comment, referring calls to city officials.

The accident sent a fleet of ambulances to the park, which is part of the Disneyland Resort complex and is located adjacent to the venerable Disneyland amusement park, which is celebrating its 50th anniversary this year.

Early Fire Department reports had indicated 60 people were slightly injured on the ride. But Nicoletti said 15 people were taken to hospitals for treatment of confirmed minor injuries. Twenty-one others were being evaluated at the scene late Friday and 13 more who were examined at the scene were able to walk away.

The roller coaster was closed immediately after the accident but other portions of the park remained open.

About 100 firefighters rushed to the amusement park, which opened in 2001 and was designed to turn Disneyland into a resort destination, much like Disney theme parks in Florida, Paris and Tokyo.

Disney spent $1.4 billion to build California Adventure, an adjacent hotel and a retail strip filled with restaurants and shops. California Adventure's main attractions include "Soarin' Over California," where people are lifted 40 feet in the air to give the sensation of hang-gliding, and "California Screamin', which hits a speed of 55 mph in about 4 seconds.

Friday's crash was the second accident in four months at a Disneyland Resort park in Anaheim.

In March, a 4-year-old boy broke a finger and severed the tip of his thumb while on the Storybook Land Canal Boats ride at Disneyland, forcing the ride to close for nearly two days while state authorities investigated the accident.

The accident occurred when the child's fingers were pinched between the boat and the dock while passengers were unloading.

Four people were hurt in December when a float at a Disneyland parade struck four people. One of the four was treated at a hospital.

In 2003, a 22-year-old man was killed and 10 people were injured when Disneyland's Big Thunder Mountain Railroad roller coaster derailed. The California Division of Occupational Safety and Health concluded the accident that killed Marcelo Torres, 22, of Gardena was the result of mechanical failure caused by improper maintenance.

Another fatality occurred at Disneyland in 1998 when a cleat used to dock the sailing ship Columbia ripped loose and struck a 33-year-old man.