A small anarchist group has claimed responsibility for 17 firebombings carried out in Greece last week and has threatened further attacks.
All but one of the attacks with makeshift bombs were carried out in Athens on Wednesday and Thursday, and they targeted people such as a top anti-terrorism prosecutor, a prominent politician and a judge.
No injuries or serious damage resulted, but the firebombings were carried out during the day, making them very unusual for arsonists' attacks in Greece.
"Our attacks are not symbolic, they are acts of war. ... We will be back soon," Conspiracy of Fire Nuclei, a self-described "urban guerrilla" group, said in a statement published on a leftist website on Saturday.
It said it dedicated its attacks to "authentic revolutionary" Dimitris Koufodinas, a prominent member of the terrorist organisation November 17, who was arrested in 2002 and is serving multiple life sentences.
The little-known Conspiracy of Fire Nuclei group only surfaced last year, and police have said they know little about it but take its threats of sustained urban guerrilla action seriously.
"This is a new development," Deputy Interior Minister Christos Markoyiannakis told Greek media on Sunday, referring to the claim of responsibility. "We must be vigilant."