The outcry followed a Spanish judge's decision to send nine members of the ousted regional government to jail while they are investigated for promoting Catalonia's declaration of independence.
"We have to admit that because this is a very special case it could pose political questions", said Maxime Chome, a lawyer and legal expert at Brussels Free University.
This constitutional crisis began when Catalan officials held an independence referendum last month, despite the Spanish government saying it was illegal.
Cracks have appeared within the pro-independence coalition of centre-right and far-left parties as well as inside Puigdemont's own PdeCat (Democratic Catalan Party) where some of his allies are now pushing for a negotiated solution with the central government. With Puigdemont and four others in Belgium, only 15 turned up.
Five other senior members of the Catalan parliament, as well as Speaker Carme Forcadell, are facing the same charges but, because of their parliamentary immunity, their cases are being handled by the Supreme Court which has yet to hold a hearing.
But instead, magistrate Carmen Lamela chose to jail eight of the politicians, only setting bail for Santi Vila, who had opposed last week's unilateral declaration.
The court summons also gave them three days to pay a deposit of €6.2m ($7.2m) to cover potential liabilities.
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