Athens - A radical left-wing group Wednesday threatened to target politicians and journalists in a proclamation sent to a newspaper following the killing of an anti- terrorism policeman last week.

In the nine-page document sent to the Greek daily Ta Nea, the militant group Rebel Sect claimed responsibility for killing the officer, the worst attack since riots rocked the country in December.

"We will strike against all mechanisms of domination, institutions and their representatives," Ta Nea quoted Rebel Sect as saying, who for the first time marked the electronic document with their seal - two guns with a black star in the middle.

"The list is large and we will hit without end," said the group, quoting Mao and Lenin.

The 41-year-old officer was shot several times at close range in the central Athens district of Ano Patissia last Wednesday while guarding a witness involved in a case against the now inactive leftist guerilla group, People's Revolutionary Struggle.

The officer died immediately while the attackers fled on motorcycle.

Rebel Sect emerged in February with a gun-and-grenade attack on an Athens police station.

Greece has been plagued by daily bombings and arson attacks targeting banks and multinational businesses since police shot a teenager in December. The shooting sparked the worst riots the country has seen in decades.

The violence that was being orchestrated by left-wing and anarchist groups has embarrassed Prime Minister Costas Karamanlis' government, which has been criticized for its inability to protect the public.

The government has vowed to crack down on the increasing violence against police, political and business targets and has sought advice from Britain's Scotland Yard. (dpa)