NHS Direct has told ITV News they are investigating one "unexpected death" after a patient in the West Midlands contacted its 111 helpline service.
NHS Direct said of the nine contracts it is currently operating, it is investigating seven "potentially serious" incidents related to calls to the 111 service.
More top news
Police have begun a raid on a restaurant where gunmen are suspected to be holding hostages.
Right-wing think tank warns leaving the UK in order to remain in the EU would turn Scotland into 'Greece without the sun'.
A poll of Britain's largest trade union, seen by ITV News, indicates more than half of those surveyed think the Labour leader should quit.