A general strike against proposed austerity measures in Belgium has grounded flights and halted public transport networks.

Approximately 80,000 people took to the streets in Brussels’s city centre on Tuesday, police said, denouncing potential cuts to social welfare programmes.

Some of the protests devolved into scuffles, as police used tear gas and protesters set off flares and smoke bombs, according to The Associated Press news agency. Several dozen protesters were detained, AP reported.

Some demonstrators carried red prohibition signs with the number 67 on them, in reference to a planned increase in the retirement age. “Right to a pension at 65,” the signs read.

Others sported a picture of conservative Prime Minister Bart De Wever with the caption “wanted for pension theft”.

“We are

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