Police are investigating claims that English language way markers for a children's mountain race in Snowdonia went missing.
Organiser Mike Blake said the local suggestion was they were removed at Moel Tryfan at Fron, near Caernarfon, because they were not also in Welsh.
He put the signs on a stretch of the 0.75 km (0.4m) route because of poor visibility in one section.
Nineteen children competed in the junior section of the competition.
They ran shortly after the adult race began, and organisers became aware of a problem only after a delay in the return of the first junior runners.
It then became apparent that the signs to help them find their way had been removed.
Other signs in the village relating to last Tuesday's race had also been removed, it is claimed.
Mr Blake said: "I marked the mountain in advance of the race.
"There's a 150 yard bleak part on the three-quarters of a kilometre route. Visibility was bad so I placed markers and signs along the route."
A North Wales Police spokesperson confirmed the matter had been reported to them and an investigation was under way.