A French judicial official says that four men suspected to be members of the Basque separatist group ETA, including a likely military chief, have been arrested in northern France.
The official says that arms, documents in the Basque language and computers were seized when the four were arrested in the town of Willencourt, in France's Pas-de-Calais region.
The official wasn't authorized to discuss the investigation and spoke on condition of anonymity.
Police from the swat team RAID, an anti-terror unit and Lille police made the arrests Thursday night. Officials were expected to spend Friday positively identifying the suspects and carrying out searches.
Spain-based ETA members often hide out in France, which cooperates closely with Madrid in hunting down suspects.