A Spanish judge has indicted 32 people on charges of plotting to bomb public buildings in Madrid in 2004.
Authorities say the men, mostly Algerians, were also charged with membership in a terrorist organization.
A court statement says the men were involved in a plot to blow up Spain's High Court with a truck loaded with explosives. The judge said the attack could have killed more than 900 people and destroyed government files on terrorism suspects. Other possible targets included the stadium used by the Real Madrid football team.
Meanwhile, seven Britons went on trial Tuesday in London accused of plotting bomb attacks in the United Kingdom in 2003 and 2004.
Prosecutor David Waters said planned targets included pubs, nightclubs, and trains. He said the attacks would have been in retaliation for British support for the United States.
All seven deny the charges.
Some information for this report was provided by AFP and Reuters.