Two men and a woman have been arrested in connection with a video circulating online showing a teenager being beaten.
The three suspects, all in their 20s, were quizzed by gardai investigating the assault and false imprisonment of a 19-year-old.
The victim of the alleged assault is currently being treated for his injuries in a north-east hospital.
Gardai in Cavan made the arrests on Monday and detained the suspects in a number of stations.
One of the men, 25, was charged on Tuesday and is to appear before Carrickmacross District Court at 10.30am on Wednesday.
The woman and other man were released without charge and a file is being prepared for the Director of Public Prosecutions.
Gardai have urged the public to report any videos appearing to show criminal activity to their local stations.
A spokeswoman said: "Gardaí in Cavan investigating the appearance of a video circulating on social media messaging apps arrested two males and one female (all in their 20s) on Monday 21 October 2019 on suspicion of an offense under Section 3 of the Non-Fatal Offences Against the Person Act 1997.
"A 19 year old male is currently being treated at a hospital, also in the North-East.
"Gardaí would like to remind the public of their commitment to combat online criminal activity and encourage any members of the public who view such offending material to refer to their local Garda Station."
