Gardai and protesting truckers and hauliers have clashed after an attempt to block the routes surrounding Dublin Port.
Motorists are being warned to expect traffic disruption in Dublin as truckers protest in the capital.
The demonstration over rising fuel prices began at 6am on Monday and saw convoys leaving various meeting points to descend on the capital.
The day of action is organised by Irish Truckers and Haulage Association Against Fuel Prices, who claim thousands of vehicles will be involved in the protest.
The hauliers caused chaos when they descended on Dublin last month.
And on Monday they were planning to do again, with a social media post from the organisers claiming that Dublin Port was the main target for the day.
Drivers were instructed that "once they stop, you do not move."
One lane was blocked off by the protestors at the port, with gardai working to keep the other two clear for traffic and deliveries.
A spokesperson for the group said: "We shouldn't have to do this today. We have been failed by our Government and the IRHA for long enough. Without us you will have nothing, you need to help us before it's too late. The Haulage & Farming Industry are finished!
Videos captured by reporters at the scene show what appears to be tense interactions between protestors and members of the force.
The Irish Mirror has contacted gardai for comment.
Dublin City Council warned drivers to expect delays and to use different methods of transport if possible.
In a joint statement with gardai, DCC said: "There is a possibility of some traffic disruption during the peak hours on Monday morning due to a planned hauliers protest.
"The public is asked to plan for any necessary journeys on Monday and to use public transport, walking and cycling where possible.
"Public transport will be operating as normal and the city centre retail and businesses will be open as normal.
"Up to date information on any disruption will be made available via AGS, DCC TII and during the peak hours via the 'Live Drive 103.2' radio station."
