MIAMI (AP) — Excessive speed caused a roller coaster to derail at a Florida boardwalk, according to a preliminary investigative summary released Tuesday. Two riders fell 34 feet (10 meters) when the front car of the Sand Blaster Roller Coaster was left dangling from the track June 14 at the Daytona Beach Boardwalk. Investigators concluded that the operating speed of the ride was the primary cause of the derailment, though they continued to assess other factors that also may have contributed, such as weather, weight distribution and lubrication of the track, according to a report released by the Florida Department of Agriculture and Consumer Services. An independent engineer also concluded that the ride's speed caused the derailment, the report said. "Operator error caused the Sand Blaster Roller Coaster derailment, which injured multiple people.Read more on NewsOK.com