Madrid , Spain ( CNN ) -- Police early Friday arrested 13 people suspected of trying to rebuild a youth wing of the outlawed Basque separatist group ETA , which was dismantled a year ago with dozens of arrests , the Interior Ministry said . The youth organization , also outlawed and known as SEGI , is considered the `` training ground for the terrorist group , '' the ministry said in a statement . The latest arrests came as police continued their crackdown against ETA and its supporters , despite ETA 's cease-fire of `` armed offensive actions '' announced last September 5 . The Spanish government and major political parties have said the cease-fire is not enough because ETA has broken them in the past . The government and the parties demanded a definitive statement from ETA to end its decades-long violence forever and lay down its arms under a verifiable disarmament process . ETA is blamed for more than 800 deaths in its long fight for Basque independence and is listed as a terrorist group by the United States and the European Union . Three hundred police officers took part in the arrests Friday of the 13 suspects , who are aged 20 to 29 and include at least one woman . The raids occurred in four northern Spanish provinces with historic Basque roots and one in Barcelona , the ministry statement said . The youth organization SEGI is blamed for fomenting so-called low-level street violence , such as the burning of municipal buses and automated teller machines , in support of Basque independence . Authorities say that some of those activists later go on to become fully-fledged ETA members who carry out shootings and car bombings . In November 2009 , police arrested 34 suspected SEGI leaders and considered that the youth wing had been largely dismantled at the time . Before Friday 's raids , police had already arrested about 20 suspected ETA members or collaborators since ETA 's declaration on September 5 .
Arrests came in northern Spain . Youth was considered ` ` training ground '' for ETA .