Dungannon's Ryan Farquhar seriously ill in hospital after North West crash
The popular local motorcyclist had recently returned to racing, after quitting the sport for several years after the death of his uncle Trevor Ferguson in the Island of Man.
The Belfast Trust said Farquhar was seriously ill after suffering chest and pelvic injuries.
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Hide AdThe other competitior involved in the crash Dan Cooper is in a stable condition in the Causeway Hospital, Coleraine, after suffering shoulder injuries.
Farquhar, 40, was airlifted by police helicopter from the track after the accident and was taken to the Royal Victoria Hospital.
Nico Mawhinney from Castledawson crashed at the Mill Road roundabout and was transported to the Royal Victoria Hospital in Belfast. His injuries were described as not life-threatening.