Pamplona, Spain  - Spanish police detained four people overnight on charges of staging acts of street violence in support of the militant Basque separatist group ETA, officials said Wednesday.

The arrests were made in Pamplona in the northern Navarre region, which borders on the Basque Country.

The detainees were believed to have links with the banned pro-ETA youth organization Segi. One of them was the brother of a man wanted by police for belonging to ETA.

Police searched the homes of the detainees, seizing computers and other materials.

ETA is blamed for more than 820 deaths in its four-decade campaign for a sovereign Basque state. (dpa)