A Luas and a Dublin Bus have been set alight in the heart of Dublin city centre.
The Luas is in flames near The Gresham Hotel, while the bus is at the bottom of O'Connell Street.
Fireworks are also being set off and a number of Gardaí have been attacked.
Specialist units have been deployed in Dublin tonight as Gardaí try to control the situation.
The incidents follow an attack on Parnell Square in the City this afternoon where several children and a woman in her 30s were hospitalised following a suspected stabbing by a man in his 50s.