On November 9, 2014, about 80 percent of the Catalans who took part in a non-binding referendum on the region's status as part of Spain voted in favor of Catalonia becoming an independent state.
Catalonia has been seeking independence from Spain for years.
Authorities in the wealthy north-eastern region insist the vote will take place, even though Spain's Constitutional Court has ordered it to be suspended and the Madrid-based national government insists it is illegal.
The statement said the six remain under investigation for disobedience, abuse of power and embezzlement and must appear before court each week. They occupied a central cloister near the offices of the dean and other university officials.
The interior ministry has not disclosed how many more police officers it is sending to the region but Spanish media said between 3,000 and 4,000 had already arrived or were on their way. It did not say how many extra police would be sent.
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Some are billeted in three ferries rented by the Spanish government and moored in the harbours of Barcelona and Tarragona because of both a shortage of temporary housing and to avoid clashes between protesters and police forces.
Regional vice president Oriol Junqueras, whose deputy Josep Maria Jove was among those held, told Catalonia's TV3 that the crackdown meant "the rules of the game have been changed".
Catalonia's executive admitted Thursday that plans for an outlawed independence referendum had been dealt a major blow by a police crackdown, but vowed to press ahead, urging support from the worldwide community.
The protest Friday in the northeastern Catalan town of Hospitalet de Llobregat is an extension of another started Thursday outside the Catalan judiciary headquarters in nearby Barcelona that attracted thousands.
The Catalan National Assembly civic group has called for the protests to continue until the regional officials are released. The next day, Spain's Constitutional Court suspended the Catalan law on referendum.