The only journalists exempt from the walkout were those covering the strike, the ESHEA journalists' union said in a statement.

Government press offices also were affected, as they are staffed mostly by journalists, the AP reported.

Journalists will join a general strike across Greece Dec. 12. On Monday, school teachers staged a walk-out. Additionally, doctors at a public hospital and public-sector engineers said they would walk off the job for three hours Tuesday morning, according to the AP.

Labour unions in Greece are opposed to measures the government has proposed that attempt to unify the nation's 170 pensions funds. Future deficits of the funds will collectively reach between €120 billion and €400 billion collectively, which are expected to start affecting the budget within 10 years. Unions worry the proposed reforms would cut future pension benefits and increase retirement ages. The next round of negotiations are set to begin Wednesday, the AP reported.