Gardaí say they are satisfied an incident involving a large group of men outside a Dublin nightclub on Saturday night was not connected to the Longitude Music Festival.

Investigators said a large number of youths gathered outside the nightclub on Adam Court off Grafton Street at around 1am.

After clashing with security staff, the men fled the scene towards Grafton Street.

Gardaí found a found a number of “offensive weapons” in the laneway after arriving at the scene.

The incident has been widely linked to a security alert issued by the US Embassy ahead of the Longitude Festival.

On its website, the embassy said it had received reports indicating a “potential for violence” at the festival, which ran on Friday, Saturday and Sunday night.

It urged US citizens to 'keep a low profile' and notify friends and family of their safety.

There were no serious incidents at the event.

In a statement this evening, Gardaí said: “Contrary to some reports, investigating Gardaí are satisfied at this stage that this incident has no connection to the Longitude Concert.”

Investigators have said there were a number of people in designated smoking areas outside nearby pubs who may have seen what happened and are calling for anyone who can assist in their investigation to come forward.

“Some of these persons may have taken mobile phone footage of the incident,” said a Garda spokesperson.

“This was also a busy time on Grafton Street in general.”

A man in his 20s has already been arrested and charged in connection with the incident.