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.
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Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
The popular game relies on Google Maps, a problem in South Korea as those functions are limited by the government.
A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.