Journalists in Greece on Wednesday joined other professions protesting the government's plans to reform the retirement system, after the umbrella organization for journalist unions called for a 24-hour strike.

Beginning at 6 am (0400 GMT), television and radio stations were blank, as journalists protested tax increases and plans to merge their retirement and health insurance programs with loss-making companies.

Meanwhile, farmers who have already been protesting Prime Minister Alexis Tsipras' reform plans for days, have blocked several border crossings to Bulgaria and Turkey using tractors, backing up traffic as much as 12 kilometres.

The labour protests are due to bring Greece to a standstill on Thursday, when public sector workers strike alongside seamen, gas station attendants, pharmacists, truck drivers and taxi drivers. Lawyers and notaries have been striking for days.

Protests against Tsipras' leftist government have widened in recent weeks, as it seeks to implement a proposal to reduce new pensions by an average of 15 per cent.

Pension savings is one of the biggest demands from Greece's international creditors to unlocking the next installment of aid.

Greece has been required to implement economic reforms in return for international bailouts that have prevented the country from going bankrupt.

Representatives from the groups overseeing Greece's bailout - the European Commission, the European Central Bank and the International Monetary Fund - must review the progress made on the reforms Athens agreed to in exchange for a bailout before the country can receive further funding.

Reviews of previous bailouts have been known to last for several months amid disagreement between Athens and its creditors over proposed reform measures.

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