On Foxnews according to a British (possibly Arab) newspaper.
Reuters is reporting the following:
DUBAI (Reuters) – A letter purporting to come from Osama bin Laden’s al Qaeda network claimed responsibility for the train bombings in Spain on Thursday, calling them strikes against “crusaders,” a London-based Arabic newspaper said.
“We have succeeded in infiltrating the heart of crusader Europe and struck one of the bases of the crusader alliance,” said the letter which called the attacks “Operation Death Trains.” There was no way of authenticating the letter, a copy of which was faxed to Reuters’ office in Dubai by the London-based al-Quds al-Arabi newspaper.
The letter bore the signature “Abu Hafs al-Masri Brigades.” The newspaper received similar letters from the same brigade claiming responsibility on behalf of al Qaeda for a November bombing of two synagogues in Turkey and the August bombing of 1.
Email received from AQ:
CAIRO, Egypt — The Arabic newspaper Al-Quds al-Arabic said Thursday it had received a claim of responsibility for the Madrid train bombings issued in the name of Al Qaeda.
The five-page e-mail claim, signed by the shadowy Brigade of Abu Hafs al-Masri, was received at the paper’s London offices. It said the brigade’s “death squad” had penetrated “one of the pillars of the crusade alliance, Spain.”
“This is part of settling old accounts with Spain, the crusader, and America’s ally in its war against Islam,” the claim said.
Referring to Spain’s Prime Minister Jose Maria Aznar, the statement asked: “Aznar, where is America? Who will protect you, Britain, Japan, Italy and others from us?”
The newspaper faxed the claim to The Associated Press office in Cairo.
The message referred to last year’s attack on Italian paramilitary police serving in the U.S.-led coalition in Iraq.
“When we attacked the Italian troops in Nassiriyah and sent you and America’s agents an ultimatum to withdraw from the anti-Islam alliance, you did not understand the message. Now we have made it clear and hope that this time you will understand,” the statement said.
“We, at the Abu Hafs brigades, have not felt sad for the so-called civilians,” the statement in an apparent reference to the hundreds of casualties in Thursday’s attacks in Madrid.
“Is it OK for you to kill our children, women, old people and youth in Afghanistan, Iraq, Palestine and Kashmir? And is it forbidden to us to kill yours?” the claim asked.