The train bombs that killed 198 people in the Spanish capital Madrid were set off by mobile phones, according to reports.Meanwhile Spain's prime minister has said police investigating the bombings will follow up every single lead.

Jose Maria Aznar vowed the inquiry will "soon bear fruit", and he pledged: "We will bring the guilty to justice."

Mr Aznar was speaking as Spain began three days of mourning for the people killed in the blasts.

A further 1,400 were injured when 10 bombs exploded in trains and rail stations in the centre of Madrid during the morning rush hour.

It was Europe's worst terrorist attack since the 1988 Lockerbie plane bombing which killed 270.

The Spanish government has accused the Basque separatist group Eta of carrying out the bombings.

But there is growing speculation that Islamic terrorists were responsible.

The Prince of Wales has sent a personal message of sympathy to Spain's King Juan Carlos.

The Prince told him: "I was utterly horrified to hear of the dreadful bomb attacks which rocked Madrid this morning.

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