The government of Catalonia, a wealthy region in northeastern Spain, has called a referendum on independence for October 1, triggering a constitutional crisis in the country.
Catalan regional interior Ministry Joaquin Forn said Friday that the central government in Madrid was planning to take control of the Mossos, after Colonel Perez had attended a meeting in Barcelona.
They would join the roughly 5,000 state police normally stationed in Catalonia and around 17,000 Mossos officers.
Hundreds of protesters gathered outside the offices of the regional government's economy ministry in the centre of Barcelona's tourist district, chanting "They will not pass" and "We will vote", a Reuters witness said.
It was not immediately clear whether the regional administration and the Mossos could actually oppose the decision, as Spanish laws allow for the possibility of state police taking the lead over the police of an autonomous community during a joint operation.
Saturday's meeting in Barcelona assessed the actions taken so far to stop the October 1 vote, the ministry official said, requesting anonymity because he was not allowed to be named in media reports.
The Spanish government in Madrid has arrested a number of Catalan officials backing the vote, as well as shutting down pro-referendum websites and raiding printing companies in search of ballot papers and boxes as well as other materials to be used for the vote.
Russian Federation could be America's greatest ally against North Korea
Previous quakes from North Korea have indicated nuclear tests by the reclusive state, the most recent earlier this month . A 3.4 magnitude quake has been detected in North Korea, according to China's state-run Xinhua News Agency .
MADRID-Spain will send more state police to Catalonia to block any moves to hold a banned independence referendum, the interior ministry said on Friday.
The Catalan government has already vowed to push ahead with the referendum, which the Spanish government considers illegal - and on Saturday said it was refusing to hand over control of the Mossos d'Esquadra police force to Spain's Interior Ministry.
Twelve Catalan government officials arrested last week have been released, but six remain under investigation.
Catalan National Assembly president Jordi Sanchez told the cheering crowds: "We will be here, peacefully but present, until all of the arrested walk out free".
"We are showing that, as students, we have a part to play". That support has been waning in recent months as Spain's national and regional economies have begun thriving again.
Bigio warned that the incarceration by the central government of regional officials and protesters in Catalonia will inflame the tensions and make the independence seekers sure to go ahead with the secession plan.