On June 6, 1987, the recently retired Colonel Roberto Díaz Herrera, resentful that Noriega had broken the agreed-upon "Torrijos Plan" of succession that would have made him the chief of the military after Noriega, decided to denounce the regime. He revealed details of electoral fraud[clarification needed], accused Noriega of planning Torrijos's death and declared that Torrijos had received 12 million dollars from the Shah of Iran for giving the exiled Iranian leader asylum. He also accused Noriega of the assassination by decapitation of then-opposition leader, Dr. Hugo Spadafora.
Panama was inhabited by indigenous tribes before Spanish colonists arrived in the 16th century. It broke away from Spain in 1821 and joined the Republic of Gran Colombia, a union of Nueva Granada, Ecuador, and Venezuela. After Gran Colombia dissolved in 1831, Panama and Nueva Granada eventually became the Republic of Colombia. With the backing of the United States, Panama seceded from Colombia in 1903, allowing the construction of the Panama Canal to be completed by the US Army Corps of Engineers between 1904 and 1914. The 1977 Torrijos–Carter Treaties led to the transfer of the Canal from the United States to Panama on December 31, 1999.
President Barack Obama addressed the overseas shell companies listed by the leak in a press conference: "It's not that they're breaking the laws," he said, "it's that the laws are so poorly designed that they allow people, if they've got enough lawyers and enough accountants, to wiggle out of responsibilities that ordinary citizens are having to abide by." Although no leader in the US was mentioned in the Panama Papers, Obama said that "Frankly, folks in America are taking advantage of the same stuff".