Two people have been injured in an incident on a berthed vessel at Lyttelton Port.

A police spokesperson told chrislynchmedia.com emergency services were called after police were advised of the incident at about 11.20am on Thursday.

A St John spokesman said it was notified of an incident on Gladstone Quay and dispatched two ambulances, one operations manager and two rapid response vehicles.

A helicopter was also dispatched but was not required at the scene.

Two patients were transported to Christchurch Hospital, one in a serious condition and one in a moderate condition.

A Lyttelton Port Company spokesperson said, “We understand an incident has occurred on a berthed vessel involving a crew member. No Lyttelton Port Company staff were involved.”

WorkSafe has been notified.

Chris Lynch Media understands the two workers were injured in the engine room of the vessel.