On May 4, 2010, the USA transferred three Guantanamo captives to three European countries, publishing their nationalities, without publishing their identities.[17] On May 19, 2010, historian Andy Worthington, author of The Guantanamo Files, reported that the Syrian transferred to Bulgaria was Maasoum. Worthington was told by local journalists that Maasoum's family had been allowed to join him in Bulgaria. Worthington's conclusion was that Maasoum and three other Syrians captured with him were probably told their interrogators the truth about being in Afghanistan as economic migrants, not jihadists.