More than 2,000 pensioners chanting "We can't live on 300 euros" marched through central Athens to protest plans by the country's left-wing government to overhaul the pension system.

Protests took place in Athens and 12 other Greek towns and cities Thursday against the proposed reforms that would merge major funds and make the system less reliant on direct state funding.

Pension funds have been severely hit by a massive debt-restructuring deal in 2012, a fast aging population, and weak contributions due to high unemployment.

The proposed reforms demanded by bailout creditors have further soured ties between the governing left-wing Syriza party and unions, which have called a general strike for Dec. 3, two days ahead of an austerity budget vote in parliament.