Mayo Mountain Rescue have reported 12 casualties in total so far as thousands take part in the annual Reek Sunday Pilgrimage on Croagh Patrick in Co Mayo today.
Two people are said to be in a serious condition, with one man sustaining a head injury at around 7am.
A second man had a heart attack near the bottom of the reek towards Murrisk Bay.
Most injuries have been minor lower leg injuries.
The pilgrimage was led by Archbishop of Tuam Michael Neary.
He was accompanied by Apostolic Nuncio Archbishop Charles Brown and Bishop of Achonry Brendan Kelly.