Spanish security forces arrested 266 people described as "terrorists" last year, according to official figures.
Spain changed its anti-terror approach after the Madrid bombings
Interior Minister Jose Antonio Alonso said most of them were either Basque or Islamic radicals.
This figure includes political leaders of the Basque militant separatist organisation Eta, arrested in southern France in October.
Mr Alonso said 62 of the arrests were made in connection with the 11 March Madrid bombings that claimed 191 lives.
The attacks made the Spanish authorities re-focus their attention from the Basque separatists to Osama Bin Laden's al-Qaeda network after investigators confirmed its involvement.
Another 42 arrests were made as a part of a crackdown on Islamists in October. This, according to police, had foiled planned attacks on high-profile targets.
Mr Alonso highlighted co-operation with France in hunting down Eta leaders, and with other countries that extradited suspects to Spain. These included Germany, Italy, Jordan, and the US.