A petrol bomb was thrown at a Department of Finance office in Dublin last night.
The flammable substance was thrown through a window of the building on Merrion St and a small fire broke out.
A garda on duty outside called the Fire Brigade just before 11pm and five units attended the scene.
However, security staff had already put out the small fire.
A small amount of damage was done to the building but no-one was injured in the incident.
Gardaí say a lone man approached the building from the Baggotrath Lane direction and threw a bottle containing an accelerant at one of the front windows.
The man was wearing a dark-coloured woolly hat and his face was covered by a scarf.
He wore a black, zip-up fleece top with a white logo and dark blue jeans. The t-shirt he wore underneath was light in colour.
Gardaí are appealing to anyone who may have seen the man to contact them.
Gardaí are also appealing to anyone who was in the area at the time and who may have witnessed the incident or who may have any information to contact them at Pearse Street on 01-6669000, the Garda Confidential Line on 1800-666111 or any Garda Station.