Accused of sedition, rebellion and misuse of public funds, Catalonia's former vice president Oriol Junqueras and seven other deposed regional ministers were headed for detention after another day of drama in Spain's worst political crisis in decades.
A ninth former minister, who resigned just before the Catalan parliament declared independence on Friday, was also remanded in jail but will be set free if he pays bail of USD 58,000.
Independence supporters have urged more protests on Friday night and a big rally on November 12 in Barcelona. Pro-independence umbrella group Crida Democracia called for a week of demonstrations.
Spanish prosecutors also sought a European arrest warrant for Catalonia's axed leader Carles Puigdemont, who is in Belgium and refused to show up to be questioned by the same judge.
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In her ruling, judge Carmen Lamela said she had ordered preventive detention for the former ministers as she believed there was a risk they could escape, given Puigdemont had gone to Belgium.
"Let's not forget the purchasing power of the defendants, which allows them to easily leave the Spanish territory and live abroad," Lamela argued in her ruling.
"Let's remember that some of the defendants have already gone to other countries, dodging possible penal responsibilities."
A total of 19 people including Puigdemont, Junqueras and the speaker of the Catalan regional parliament had been summoned to be questioned today.
A hearing of the speaker and five others at the Supreme Court was adjourned until November 9 after their lawyers requested more time to prepare their defence.
He was referring to regional elections called on December 21 by Prime Minister Mariano Rajoy in a bid to "restore normality" to a region rocked by the secession bid.
"The conflict between Catalonia and the Spanish state won't be resolved through courts and violence," former Catalan president Artur Mas, in Madrid to show his support, said earlier.
"The more fuel and wood you add to the fire, the bigger it becomes."
Puigdemont's government organised an independence referendum on October 1 despite a court ban.
Spanish police tried and failed to stop it, in some cases firing rubber bullets at people defending polling stations.
A declaration of independence by the Catalan parliament followed last Friday, greeted by celebrations on the streets of Barcelona.
But that same day, Rajoy's government dismissed the regional government, imposed direct rule on Catalonia and called the December elections.
Marta Rovira, a lawyer and Catalan separatist lawmaker, briefly broke down in tears as she spoke to reporters in Madrid after the announcement of the detentions.
In Barcelona earlier today, several hundred demonstrators gathered in front of the regional government chanting "freedom" and "Puigdemont is our president".
"(Puigdemont) hasn't fled, it is a political strategy... forcing the EU to take a stand," said Jorde Segu, 68, a retiree. "He's a hero," added secretary Lidia Amoraga, 62.
Catalans, fiercely proud of their language and culture, remain deeply divided about independence, polls indicate.
The European Union, several members of which have disgruntled regions of their own, has swung firmly behind Rajoy.
Spain's central bank also warned today that the region risks suffering an economic recession if the strife continues.