The Independent on Sunday quotes the Spanish Interior Minister Angel Acebes:
"The dramatic announcement came six hours after Spanish police arrested five men ? three Moroccans and two Spaniards of Indian origin ? in connection with their investigation into Thursday's bombing which killed 200.
At an earlier news conference, Mr Acebes, said the five were held in connection with a mobile phone and phone cards found inside an explosives-filled backpack which failed to detonate. Ten other bombs devastated four commuter trains in Thursday's attacks, and another two backpacks were destroyed in controlled explosions. One of the suspects "could be related to Moroccan extremist groups", Mr Acebes added, "but we should not rule out anything."
Moroccan security experts were expected in Madrid today to participate in the investigation.
All the arrests were made "for presumed implication in the sale and falsification of the mobile phone and cards found in the bag that did not explode", the minister said. The detentions were the first tangible fruit of frenetic investigations into the tragedy, and point strongly to Islamist ? rather than Basque separatist ? radicals as being responsible, a development which could impact on today's general election in Spain."
It would not be surprising if the people arrested have nothing to do with the actual terrorist bombers, except through having sold them some mobile phones or Subscriber Identity Modules (SIM) cards.
The Moroccan suspects seem to have been running a mobile phone and television shop for the past 4 years.
How likely is it that Al-Quaeda would leave any clues from Mobile Phones after the "Operation Mont Blanc" Swisscom SIM affair ?
Other reports claim that bomb's detonation mechanism was triggered by a mobile phone (an all too common technique used in the Middle East or Latin America)
Some TV terrorism pundits speculated that if the trains had not been delayed by 2 minutes, the detonations would have taken place inside the railway station, possibly causing even more casualties, especially if the roof collapsed as well. c.f. the BBC's timeline and locations of the 10 explosions.
The El Mundo reports, briefly, that the Mobile Phone was a Trium model, with the language settings set to Spanish, and that it was the alarm function which was intended to be used to set off the explosion i.e. not a mobile phone call or SMS message per se.
"El tel馯no m encontrado en la mochila de Vallecas, de tarjeta prepago y de la marca Trium, estaba programado para que su alarma sonara a una hora determinada y activar as�l explosivo. Ademᳬ la configuracie las opciones del aparato estaba en espa"
Presumably, the mobile phone records, including which phone called which, at what time and from which Cell Location, of not just the 5 people arrested and the other two Spanish nationals of Indian origin who have been questioned but of virtually every mobile phone user in the Madrid area are being analysed by computer.
Are UK phone records calling to/from Spain, also being so analysed, in the spirit of "maximum cooperation" with the Spanish authorities ?