A probe by Hong Kong's aviation accident investigation agency revealed Cathay Pacific's Airbus A350 engine failed in-flight due to a ruptured fuel hose which also showed signs of a fire, the agency's report stated on Thursday.

Hong Kong aviation investigators say an engine problem that caused Cathay Pacific to ground its entire fleet of Airbus A350 jets for inspection earlier this month could have escalated into “extensive damage.

The engine defect in the Airbus A350 plane that led to the cancellation of dozens of Cathay Pacific flights in early September could have escalated into "extensive damage", according to a Hong Kong probe released Thursday.