The offices of four politicians in Thessalonki were attacked by arsonists last week.
The offices of Deputy Interior Minister Costas Gioulekas, Deputy Culture Minister Yiannis Ioannidis, the head of Democratic Revival Stelios Papathemelis and PASOK MP Stathis Koutmeridis were torched as well as the local offices of PASOK.
Four banks and a New Democracy office in Vyronas were also set on fire.
Arsonists attacked a boatyard in Argyroupoli, southeastern Athens. An incendiary device went off outside of Kappa Marine according to officers.