(CNN) -- In what the interior minister calls one of Spain's largest operations against al Qaeda, security services said Thursday they arrested three suspected terrorists who might have been plotting attacks on U.S. or British targets. Two of the men were arrested Wednesday and the third Thursday, Spanish Interior Minister Jorge Fernandez Diaz said. The Interior Ministry said the men were "ready to act in Spain and Europe." One of the men is Turkish, and the other two are believed to be of Russian-Chechen origin. Police sources said they had gathered enough explosives to "blow up a bus." The two men arrested Wednesday were on a bus traveling to France when police detained them, and Diaz said they "resisted fiercely." Police sources said they were stopped in Almuradiel, a town about midway between Madrid and the country's southern coast.
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NEW: Security services: Men were most likely plotting attacks on U.S., British targets
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NEW: They say the men also may have been planning an attack in France
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NEW: Police found explosives in the apartment of one of the men
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The suspects had information about remote-controlled airplanes, authorities say
Wiretaps indicate that the @placeholder citizen's wife had "removed evidence from the house" before the arrest.