Investigations into the incident were continuing this morning.
A Dublin gig headlined by African artist Naira Marley was shut down by gardai last night after a gang of youths were spotted fleeing the scene.
The incident unfolded at Lost Lane just off Grafton Street before the headline artist took to the stage to perform.
A video seen by Dublin Live shows up to 30 young men running out of the premises in the early hours of Sunday morning, with revellers of the adjoining pub looking on in confusion.
The scene remained closed off to the public this morning, and gardai have since confirmed that a number of weapons have been seized and a man in his 20s arrested in connection with the incident.
One person in attendance at the gig told Dublin Live that gardai arrived on the scene and “drove everyone out” before shutting the show down.
They said: “An African artist ‘Naira Marley’ was headlining a show at Lost Lane yesterday with some other upcoming acts.
“We came for the event which started around 10:30pm.
“People were waiting for the artist to perform when all of a sudden gardai came to the venue, drove everyone out and shut it down.
“Afterwards Garda came in tens and filled everywhere. Everyone was still surprised and curious as to what was going on because no gang attacked or anything.
“They [the crowd] filled the street around the venue confused as to where to go and some [were] angry at the organisers asking for refund.”
One onlooker passing by the area this morning told Dublin Live that it was sealed off by gardai who were carrying out an investigation.
In a statement, gardai confirmed that investigations are ongoing.
A garda spokesman said: “Gardai are investigating an incident where a large number of male youths congregated outside a premises on Adam Court, Dublin 2 at approximately 1am on 7 July 2019.
“A number of offensive weapons were located after the youths departed and were seized by Gardaí. One male in his early 20s was arrested and was charged in relation to this offence. Investigations are ongoing.”
Dublin Live has contacted a representative of Lost Lane for a statement.