(ANSA-AP) - ATHENS — A Greek state TV exit poll is projecting that anti-bailout party Syriza has won Sunday's parliamentary elections — in a historic first for a radical left wing party in Greece.

But it's unclear whether Syriza has won a decisive enough victory over Prime Minister Antonis Samaras' incumbent conservatives to govern alone. For that, they need a minimum 151 of parliament's 300 seats.

The centrist Potami (River) party is battling for third place with the Nazi-inspired, extreme right-wing Golden Dawn, whose leadership is in prison pending trial for running a criminal organization.

Syriza leader Alexis Tsipras has promised to renegotiate the country's 240 billion-euro ($270 billion) international bailout deal. He has pledged to reverse many of the reforms that creditors demanded in exchange for keeping Greece financially afloat since 2010.

A senior official in Greece's governing conservatives has conceded defeat to the radical left Syriza party in Sunday's national elections. "We lost," Health Minister Makis Voridis told private Mega TV. "The extent of that result is not yet clear." Voridis, the conservative party's parliamentary spokesman, says the government's austerity policies, implemented to secure vital international bailouts, "make sense" but were cut short before they could bear fruit.

An exit poll on state Nerit TV projects Syriza winning by a wide margin. (ANSA-AP).