The Chief Justice of the High Court in Catalonia, Jesús María Barrientos Pacho, has ordered the Catalan Police, the Mossos, to allow National Police officers to share security duties to protect the building and that those officers are not placed under the command of the Catalan Police.

The National Police are now in charge of the security of the building, the Chief Justice said, citing an article of the 1986 Security Forces Act that puts state-level forces in the lead when they coincide in an operation with one of Spain's regional police forces.

A spokeswoman for the court told The Spain Report on Monday that around 10 National Police officers had already been deployed to the building, under the command of an officer of superintendent rank.

The National Police would not confirm those details.

The Catalan First Minister, Carles Puigdemont, is expected to use a session of the regional parliament tomorrow to make some kind of declaration of independence from Spain.

Judge Barrientos said in the order that he had taken the decision in order to "preserve the integrity of the judiciary and the normal working of the court I preside", as well as the independence of its judges.

The order means the Chief Justice of the most senior court in Catalonia—which the suspended separatist referendum and secession laws designate as the new Supreme Court of Catalonia—no longer trusts the Catalan Police to ensure the physical security of the building or the safety of its occupants.

The order says Catalan separatist leaders are "determined" to go ahead with the declaration of independence.

That determination places "the integrity of this court" and "the independence of its magistrates" in danger.