The National Transportation Safety Board says it has found an issue with the main fuel supply line in an airplane that caught fire as it taxied for takeoff from Fort Lauderdale/Hollywood International Airport.

In issuing preliminary findings on Tuesday, the NTSB said the main fuel supply line coupling assembly had disconnected near the left engine of the Dynamic International Airways plane. The coupling assembly has been retained for further investigation.

The agency says the fire did not penetrate the fuselage.

The NTSB is reviewing the Greensboro, North Carolina-based airline's plane maintenance records. Officials plan to wrap up the onsite investigation Tuesday.

A pilot in a plane behind the Caracas-bound Boeing 767 saw the fire Thursday and alerted authorities. Passengers evacuated by sliding down chutes. Of the 90 onboard, one was seriously injured; 21 suffered minor injuries.