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Christophe Ena, Associated Press
Airport security personnel demonstrate next to police officers to demand negotiations with management over an increase in pay, at Roissy Charles de Gaulle Airport, north of Paris, Wednesday, Dec. 21, 2011. French airport security personnel are on strike for a sixth straight day, leading to long lines and potential delays at Paris' busiest airport.

BRUSSELS — Strikes to protest austerity measures paralyzed ground traffic in Belgium and hit Christmas travelers in several nations across Europe, promising days of headaches through the holidays.

Workers were walking off the job to show their ire at budget-slashing measures by their governments to tackle debt and high deficits, and officials were scrambling to try to mitigate delays and cancellations.

Eurostar and Thalys idled part of their popular service through Brussels as Belgian transport workers walked off the job. In France, a strike by airport security personnel stretched into its seventh day, and in London, football club Arsenal postponed its day-after-Christmas game against Wolverhampton Wanderers by 24 hours because of a planned public transport strike on the U.K.'s Boxing Day holiday.

The French government, anxious to avoid angering voters ahead of next spring's presidential election, was looking at options on Thursday to get police to replace security personnel and make sure Christmas Sunday is as undisturbed as possible.

"The issue is to have airplanes take off so that the French people who have had a tough autumn and are feeling the crisis can get to their families and not be blocked at airports," Transport Minister Nathalie Koscusko-Morizet said on France Info.

In Greece, train workers planned a five-hour work stoppage from noon Thursday, and in Spain more airline and transport action is expected next week.

The major unions in Belgium were protesting pension reform being pushed through Parliament for early next year that would require people to wait two years longer before early retirement. All but one of Belgium's major airports were operating close to normal, but intermittent road blocks by strikers worsened road delays around the capital. The strike also affected postal services, schools and hospitals.

At the Brussels South train station, the tracks of the popular Eurostar and Thalys trains linking London and Paris through Brussels with Amsterdam and Germany, remained empty.

"Eurostar and other onward connecting rail services will not be able to operate to or from Brussels during this period," the rail company said of the 24-hour strike.

Simply waiting a day would be tough for holiday travelers since the trains are often fully booked for days on end.

All local lines were canceled on Thursday, too, keeping many workers home.

"Again, it is at the expense of travelers. We are literally left out in the cold," said Kees Smilde of the TrainTramBus consumer group.

The reforms are part of a slate of austerity measures approved by Prime Minister Elio Di Rupo's coalition to get Belgium out of the financial crisis.

Unions were especially irked that the government is trying to push through pension reform, sidestepping the traditional worker-employer negotiations that have become a cornerstone of the nation's welfare state system.

Workers "are striking against the government retirement measures because they are imposed on us in the absence of any kind of social negotiations," the Socialist ABVV union said in a statement. Another day of action is planned for Jan. 30, when a summit of EU government leaders is planned.

In Paris, the airport security personnel strike continued but delays were shortening and no flight cancellations were recorded at De Gaulle, Paris' busiest airport Wednesday.

Unions representing workers who conduct patdowns on travellers and operate the bag-screening machines launched the walkout a week ago to demand negotiations over an increase in pay. It was timed for maximum effect during the holiday getaway season.

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Greg Keller from Paris, Elena Becatoros from Athens and Ciaran Giles from Madrid contributed to this story.