Disney's California Adventure, Anaheim, CA, USA - Fifteen were sent to the hospital at around 6:30 p.m. yesterday on California Screamin' as the result of a minor collision involving two completely full trains.Around 100 emergency personnel responded to the accident, which involved forty-eight passengers. All guests involved were examined for injuries, but two-thirds did not require medical treatment.In a statement from the Disneyland Resort, the park said that they were assisting all of those involved in the accident with the appropriate action.It is unknown how the incident happened, and an investigation is taking place to determine the cause.