A farmer died and his twin brother was seriously injured after being attacked by a bull on their farm.
Patrick Dowds (65) died at the scene of the incident at Toulette, near Burt in north Donegal.
His twin brother George went looking for him around 2.30pm yesterday after Patrick failed to return the farmhouse they shared.
He found his brother dead in a field on their farm.
He was then also gored by a bull and was being treated in hospital in Letterkenny last night for his injuries, which are not believed to be life-threatening.
Gardaí began an investigation on behalf of the north Donegal coroner while the Health and Safety Authority has launched its own probe.
Family friend John Ryan, a local Fine Gael councillor, said the Dowds were experienced farmers.
Local councillor John Ryan said Mr Dowds was an extremely competent and seasoned farmer who was well known and enormously well respected in the area.
"There is absolute shock in the local community. Patrick was an absolute gentleman and someone who personally I was very fond of," he said.
"We all know that farming can be a very dangerous industry to work in, but this just looks like a freak accident."
Speaking before visiting George Dowds in hospital last night, parish priest Father Brendan Crowley said: "I know both men very well.
"Patrick was an absolute gentleman and all our thoughts and prayers are with his family. We're praying for a speedy recovery for George."