Catalonia cannot hold a Scottish-style vote on independence, the Spanish Government has said after Nicola Sturgeon's intervention in the debate.

Catalan nationalists intend to hold a vote on the region's independence on October 1, which the country's central government has deemed illegal.

Spanish authorities have arrested officials, seized papers and raided newspaper offices in an attempt to stop the ballot.

The First Minister told MSPs on Thursday that she was concerned about the situation and supported Catalonia's right to self-determination.

Sturgeon suggested that the Edinburgh Agreement - which set the terms for Scotland's 2014 vote on independence - could be replicated in Spain.

In response, the Spanish Government has said such an arrangement would be impossible under the country's constitution.

"We would like to underline that Spain cannot apply the United Kingdom's solution for the Scottish issue: our historical origins and our legal-political systems are different," a spokesman said.

"The Spanish constitution enshrines the Spanish nation as a political and social reality prior to the constitution itself.

"Therefore, national unity is the basis of our constitution. There are established procedures to amend the constitution.

"Therefore, in our legal framework, a referendum in the form proposed by the United Kingdom to Scotland would only be possible if the constitution were amended."

A pro-Catalan demonstration took place in Glasgow following Sturgeon's remarks on Thursday.

Fourteen Catalonian government ministers have reportedly been arrested by Spanish authorities, a move which the Catalan regional government has described as "anti-democratic".

Catalan president Carles Puigdemont has accused Spain of violating the Charter of Fundamental Rights of the European Union and said Catalonia will not compromise.

Meanwhile, Spanish prime minister Mariano Rajoy has urged the nationalists to abandon their plans and stop what he described as the "escalation of radicalism and disobedience".