Sporadic clashes broke out in central Athens Thursday as tens of thousands marched to the Greek Parliament during a general strike called to protest planned pension reforms that are part of the country's third international bailout.

Dozens of hooded anarchists threw petrol bombs and stones at riot police, who responded with tear gas and stun grenades. Police said a journalist was attacked by rioters and taken to hospital but was not in serious condition.

Overall, police said about 40,000 people took part in two separate, consecutive demonstrations through central Athens. Smaller protests were held in other major cities.

Unions are angry at pension reforms that are part of Greece's third international bailout. The left-led government is trying to overhaul the country's ailing pension system by increasing social security contributions to avoid pension cuts, but critics say the reforms will lead many to lose two-thirds of their income.

Opposition to the reform has been vociferous, uniting a disparate group of professions, including farmers, artists, taxi drivers, lawyers, doctors, engineers and seamen among others.

Thursday's general strike is the most significant the coalition government of Prime Minister Alexis Tsipras has faced since he initially came to power a little more than a year ago. As an opposition party, Tsipras' radical left Syriza party had led opposition to pension reforms, but he was forced to ditch his earlier stance when faced with the stark choice of signing up to a third bailout or the country having to leave the euro currency.

Syriza's difficulties with the pension reform plan were evident in the party's statement that it was backing Thursday's strike.

Athens pensioner Yannis Kouvalakis said Tsipras' government "fooled" Greeks by promising to reverse austerity cuts.

"Because they are from the left, what happened? Was the situation saved? Things got worse. They'd said they'd give some money to pensioners or the unemployed, increase the minimum wage to 750 euros [per month]," he said. "They cut five euros from my pension ... What can they give? Forget it."

The strike comes as the government negotiates with Greece's international debt inspectors, who returned to Athens this week to review progress on the country's bailout obligations. The central Athens hotel where the inspectors were staying was heavily guarded by police.

Ferries between Greece's islands and the mainland remained tied up in port as part of the strike, while only limited public transport was operating in Athens for a few hours in the day and taxis also stayed off the streets. More than a dozen domestic flights were canceled, while farmers maintained their blockades of highways that have forced motorists into lengthy detours.

State-run hospitals were functioning on emergency staff, while state schools, many shops and gas stations were shut.

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