Spanish investigators found a video in which Yalcin was flying a remote-controlled airplane, according to Reinares.
Police then drove with Yalcin and an official of the Spanish judiciary to his residence.
Authorities later identified the Turkish national as Cengiz Yalcin, and the others are Ahmad Avar and Muhammad Adamov.
Much of Mr Yalcin's reporting purported to expose inconsistencies in the prosecution's case.
Also found in Yalcin's home was equipment for three motorized paragliding machines.
"We will fight for damages for all the losses we suffered, " Mr Yalcin says, sipping tea on the floor of his pink house.
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But police were frustrated by a judge's refusal to grant an immediate search warrant for Yalcin's apartment after his arrest, according to Reinares.
Yalcin, the Turkish suspect, was ordered detained immediately after his arrest.
Yalcin said Friday that he had no knowledge of explosive substances found during a search of his home, according to source briefed on the court proceedings.
Yalcin told a Spanish investigating judge Friday that he was an enthusiast of motorized paragliding and wished to teach his two Chechen associates how to fly them.
Authorities say they believe Yalcin had been the logistics man of the group, and had been living legally in Spain where he worked for a construction company in Gibraltar.
Yalcin stands accused of possession of explosives substances.
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