Three backers of Catalonia's independence have sought to secure release from jail for their role in the region's push to break from Spain which triggered the country's worst political crisis in decades.

A Spanish judge has agreed to jail Catalonia's top parliamentarian in the rebellion probe stemming from the regional parliament's independence vote, setting her bail at 150,000 euro and ordering her passport confiscated.

The crisis in Catalonia has gathered a dangerous momentum. 

Spain's Constitutional Court has ordered Catalonia's parliament to suspend a planned session next week during which separatist lawmakers wanted to declare independence.