The elderly man was among a number of people hurt in the "terrifying" incident at St Patrick's Cemetery in Co Louth, the parish priest said.
The incident happened shortly before 3.30pm.
It is understood from initial investigations that a dark coloured vehicle drove at a number of people in the cemetery who were attending the annual blessings of the graves event.
A MAN was seriously injured yesterday after a being struck by a auto in a Co Louth cemetery.
The auto involved fled the scene at high speed, and the suspected driver was arrested after crashing nearby.
"We were coming towards the end of the blessing of the graves and I could hear screaming and shouting to my left and I looked round and I could see loads of people running and screaming and shouting", he said.
The injured man was taken to Our Lady of Lourdes Hospital in Drogheda, while a "small number of people received superficial injuries", Gardai said.
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"People who were very close to where the auto sped through were jumping aside".
"People are very angry that anyone would show such disregard for people's safety".
After colliding with a number of people, the auto reportedly turned around and then sped out of the area.
He said he had jumped out of the way as the vehicle was driven towards him.
A man in his 20s believed to be the driver continues to be held at Dundalk Garda Station this afternoon.
Investigating Gardaí are appealing for witnesses to contact them at Dundalk Garda Station on 042 9388400, particularly anyone who may have captured video footage.