Adamov, the other Chechen, had received explosives training in Afghanistan, where he become an expert in managing explosives and may have participated in a recent bomb attack in Moscow, according to Spanish authorities.
Two Chechen-Russians -- Eldar Magomedov (also known as Ahmad Avar) and Muhammad Adamov -- whom Spanish security services suspect had been tasked with carrying out an attack, were arrested on a bus travelling towards France.