A "vicious" fight broke out at Dublin Airport which left one man "pumping blood" on the ground, according to an eye witness.
The row had to be broken up by the Airport Police before paramedics arrived to attend the injured parties.
One man was taken to Beaumont Hospital while another, in his 20s, was arrested.
Read more: Dublin Airport security queues: What time to arrive before a flight and advice to avoid travel chaos
Footage seen by Dublin Live appears to show two men exchanging blows in the airport as other passengers look on aghast.
A third man joins in and doles out a flurry of punches which knocks one of the men to the ground.
Towards the end of the video, screams are heard as the fallen man is kicked in the head until he is unconscious.
A number of people then drag him away from the others.
The horrifying incident went on for at least two minutes and 10 seconds.
Three flights departing the airport were delayed but it is unclear if this is related to the fracas.
A Dublin Airport Authority spokesman said: "daa can confirm that an incident occurred at Dublin Airport this evening which was attended by An Garda Siochana.
"As this incident is subject to a police investigation, we are unable to comment further at this time."
A garda spokesman said: "Gardaí, with the assistance of the DAA Airport Police responded to a public order incident at Dublin Airport earlier this evening, 24th May 2022.
"One man has since been taken to Beaumont Hospital where he is receiving treatment.
"One man (20s) was arrested and is currently detained at Swords Garda station."
The spokesman added that "investigations [are] ongoing."
Read more: George Hook says 'get a life' to Dara O Briain after Dublin Airport complaints
Read more: Gran Canaria holidays: 7 things to do from parks to cruises
Sign up to the Dublin Live Newsletter to get all the latest Dublin news straight to your inbox.
