The Greek anarchist group Rubicon snuck into their country’s Foreign Ministry building in central Athens on Tuesday to oppose Greek-Israeli military and energy cooperation, in addition to the decision by the United States to move its embassy three months ago from Tel Aviv to Jerusalem.

Two Rubicon members climbed into the ministry compound and left a bag near the entrance, according to a video posted online, which the group said consisted of a Palestinian flag and photographs of Palestinian protesters killed by Israeli forces during violent riots along the Gaza border that coincided with the embassy opening ceremony on May 14.

No arrests of Rubicon members were reported.

This development comes a year after Rubicon members vandalized the Israeli embassy in Greece to protest Israeli policies toward Palestinians.

Greek and Israeli forces, often joined by the United States, conducted their latest joint drill in June, when warplanes from both nations “simulated a war on multiple fronts, including a significant bombing campaign against targets in the Gaza Strip. The IDF said 40 of its fighter jets, refueling planes and transport planes traveled to Greece for the exercise,” according to The Times of Israel.

Greece and Israel, alongside Cyprus, agreed to plans in May for a $7 billion pipeline that would supply gas from the eastern Mediterranean to Europe.

Greek Prime Minister Alexis Tsipras called the project “emblematic” of the cooperation between the three countries.