A number of people were arrested in Dublin city last night at Leinster House.
It is understood that those arrested were protesting as part of Extinction Rebellion.
A number of TDs were blocked from leaving the building as a result of the protest.
Among those who were kept from leaving was Dublin Fingal TD Alan Farrell, who said as many as 70 gardaí were present to deal with the protest.
It is understood protesters stood down at around 1am, after which those blocked inside the gates of Leinster House were able to leave.
Protester who chained themselves to the Leinster House Merrion Gate at 6pm are still there having refused to unlock themselves. 60-70 Gardaí, a dozen Garda vehicles, an ambulance, a fire engine, the public order unit & probably more out of sight. pic.twitter.com/i7TFlJX9FF— Alan Farrell TD (@AlanFarrell) October 10, 2019
It is the latest in a series of protests in Dublin City centre as part of a week of demonstrations staged by the environmental group.
Meanwhile in London, a large group of Extinction Rebellion activists have camped outside the main entrance of the BBC, and staff have reported being unable to enter the building.
The group has called on the broadcaster to "tell the full truth" in its coverage of the environment.
Financial journalist Paul Lewis tweeted that the entrance to New Broadcasting House had been "locked down".
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Additional reporting PA