Equatorial Guinea Obiang Mangue, and other close relatives with powerful positions in the security forces. The tension may be rooted in a power shift arising from the dramatic increase in oil production which has occurred since 1997. In 2004 a plane load of suspected mercenaries was intercepted in Zimbabwe while allegedly on the way to overthrow Obiang. A November 2004 report named Mark Thatcher as a financial backer of the 2004 Equatorial Guinea coup d'état attempt organized by Simon Mann. Various accounts also named the United Kingdom's MI6, the United States' CIA, and Spain as tacit supporters of the coup attempt. Nevertheless,
2004 Equatorial Guinea coup d'état attempt that the Foreign and Commonwealth Office did investigate if there were any British companies involved in the plot after receiving confidential reports, but failed to find any evidence. British officials, and Jack Straw, were forced to apologise to "The Observer" after categorically denying they had prior knowledge of the coup plot. President Obiang accused the Spanish government of supporting the plot. The allegation could explain the coincidental position of two Spanish warships off the coast of Equatorial Guinea, at the time of the arrests of the alleged plotters. Miguel Mifuno, special adviser to Equatorial Guinea's president, accused the Spanish government