Passengers on board a United Airlines flight from San Francisco to Hawaii had a scary trip after the casing around one of the engines ripped apart.

Video and images shared online showed the casing coming apart on the journey over the Pacific Ocean.

Passengers braced for an emergency landing as flight UA1175 arrived in Honolulu and they burst into applause when it touched down.

The plane carrying more than 370 people on board including crew members, landed without incident at Honolulu International Airport.

The pilots of United flight 1175 declared an emergency due to a vibration in the right engine before the plane landed safely.

The Federal Aviation Administration has said it is investigating the incident.