The Health Safety Executive say they are involved in a joint investigation with North Wales Police into the death of a man at a farm in Llanrug near Caernarfon.
They say they are treating the death as a 'construction incident.'
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40,000 people are expected at the motorbike event in the capital this weekend.
The comedian visited the area in 1964 after apparently upsetting people with one of his routines.
The daughter of former Ospreys player Jerry Collins has been pictured recovering in hospital in France after a fatal crash last month.