People wearing carnival masks hurled petrol bombs at the offices of Greece’s ruling SYRIZA party in central Athens on Sunday, causing slight damage, police said.
Authorities said the group threw “two or three” petrol bombs. A Reuters witness saw damage to two cars parked outside the building, blackened walls and chips in window panes.
Greece has received three international bailouts since 2010 and measures to contain its debt crisis have sent the economy into its worst recession since World War II.
Protesters often clash with police, although violence is rarely widespread.