In comments on Monday, conservative New Democracy leader Kyriakos Mitsotakis blamed the leftist-led government over the latest spate of violence carried out by self-styled anarchists and accused the authorities of negotiating with terrorist suspects.
"Violence and lawlessness has unfortunately extended beyond the center of Athens to other cities," Mitsotakis said.
"Citizens feel unsafe as they and their properties are at the mercy of various hooded assailants who are operating unchecked," the ND leader added.
Referring to last week's decision to transfer terrorist suspect Constantinos Giagtzoglou back to Attica's Korydallos Prison from a penitentiary in Larrisa, Mitsotakis said the government had reached "the unprecedented point of negotiating with a terrorism suspect and eventually doing what was asked of it."
Giagtzoglou had started a hunger strike after his transfer to Larissa but stopped the action once authorities decided to move him back to Korydallos. The move is expected to happen next month.
Many of the acts of vandalism and protests in recent days have been held by anarchists declaring "solidarity" with the 29-year-old who is accused of sending a parcel bomb to former prime minister Lucas Papademos last year.