Spain's National Court on Sunday jailed seven people on charges of belonging to a militant cell of the Basque separatist group ETA.

The cell is believed responsible for a string of recent bombings, and investigators believe its members were planning more attacks.

The seven will be held in provisional preventive custody pending a full trial, anti-terror judge Baltasar Garzon said in a statement. A date for the trial was not given.

All seven were detained Tuesday in police raids in the Basque towns of Getxo and Elorrio. Among those jailed was the suspected leader of the cell, Arkaitz Goikoetxea.

Garzon said the cell was suspected of having perpetrated many recent attacks, including the May car bombing of a police barracks in Legutiano, northern Spain, in which one officer died.

After the detentions, Goikoetxea led officers to two caches of explosives and other terror-related material, including tranquilizers to sedate kidnap victims, the judge said in the statement.