A judge will decide if the five have a case to answer

The men, three Moroccans and two Indians, have not been charged. They were arrested on Saturday.

The five are being held under Spanish anti-terror legislation; they all say they are innocent.

More than 200 people were killed and more than 1,000 injured in the series of blasts.

The five men have been put into isolation in Madrid's Soto de Real jail for a further five days.

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The investigating magistrate in the case, Juan del Olmo, will then decide whether to let any of the men go, whether to press formal charges, or to extend their period of imprisonment without charge under Spain's anti-terrorism act.

Judge del Olmo questioned each of the men individually for seven hours, with the hearing ending at 0300 GMT, says the BBC's Katya Adler in Madrid.

According to the charge sheet, for the next five days the three Moroccans - Mohamed Bekkali and the brothers, Jamal Zougam and Mohamed Chaoui - will continue to be questioned on suspicion of belonging to a terrorist organisation.

They also face accusations of murdering 190 people, of carrying out 1,400 attempted murders, of stealing a vehicle and four counts of carrying out terrorist acts, our correspondent says.

Although 202 people died in the bombings, only 190 bodies have been identified.

Mobile phone

The two Indian nationals, Vinay Kohly and Suresh Kumar, will continue to be questioned on suspicion of collaborating with a terrorist organisation, of fraud and of falsifying documents.

They told the investigating magistrate that on 11 March at the time of the attacks they were in bed sleeping in their respective homes.

The five were arrested on Saturday in connection with the discovery of a mobile phone rigged to detonate a bomb which failed to explode during the attacks.

On Thursday, Spanish police seized five more suspects over the bombings, bringing to 11 the total number of arrests over the blasts.

An Algerian picked up for questioning earlier this week was released on Friday, court officials said.

The man was arrested in the northern Basque region after a police officer remembered that he had threatened in January to massacre people in Madrid.

Court sources had described the man as disturbed.

The police is continuing its investigation into the 11 March train attacks and say they are following several leads.