The home of the American ambassador to Greece was vandalised with paint on Wednesday, police and the ambassador said, a move likely carried out by domestic radical anarchists.
"I woke up to more childish vandalism this morning outside the residence and will continue to work with Greek authorities to punish the culprits according to law," ambassador Geoffrey Pyatt said in a tweet.
"Destruction of property is not peaceful protest," he said.
Police said a group of ten persons on motorcycles approached the ambassador's residence and threw paint.
Radical anarchists and domestic far-left outfits regularly carry out acts of violence against diplomatic missions in Greece.
Anarchists in recent days have carried out vandalism attacks in support of a jailed prominent member of the far-left Greek extremist organisation November 17.
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Dimitris Koufodinas, the organisation's main hitman who is serving multiple life sentences, went on hunger strike this month after a furlough request was denied.
November 17 launched dozens of attacks between 1975 and 2000 that killed 23 people, including the CIA station chief in Athens, several prominent Greek businessmen and the British military attache.
The group was dismantled in 2002.