The Greek journalists' union (ESHEA) has announced a 24-hour strike starting at 6 a.m. Tuesday until the same time on Wednesday to protest against the new batch of austerity measures whose implementation the government has agreed with Greece's creditors in order to conclude the second review of the country's third bailout.
Ferry services was also due to come to a standstill on Tuesday and Wednesday, while unions have called a general strike on Wednesday.
The Panhellenic Seamen's Federation said it was asking "for the understanding and full support of both the traveling public and all Greek workers", adding that the new measures would lead seamen "to poverty and destitution". News websites were not being updated, and no Wednesday newspapers would be printed.
Public transport and the public sector also expect to see strikes in coming days.
No ferries were to sail in the Ionian and Aegean seas, the national coastguard confirmed.
Protest marches have been scheduled for central Athens in the morning.
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The proposed measures include additional pension cuts in 2019 and income tax rises in 2020, along with further attacks on workers' rights and social security and declaring Sunday a work day.
Greece's state health system has been hit hard by deep spending cuts imposed under the country's global bailout program.
Greece is now in the midst of its third bailout program - the current three-year program expires in the summer of 2018 and could be worth up to 86 billion euros ($95 billion) in total.
Greek public finances are now being propped up by a third successive bailout, monitored by European Union institutions and the International Monetary Fund.
ATHENS/LONDON Greece is eyeing its first sovereign bond issue in three years as early as July if its global lenders specify longer term debt relief for the country, and the European Central Bank includes it in its bond-buying program.