According to an informed source John Negroponte plotted the attack during an unannounced trip to Iraq on June 12 in order to fuel insecurity and sectarian violence in the country.
Negroponte's motive was to overthrow Iraq's legitimate government, the same source added.
Negroponte, who was a staunch supporter of right-wing death squads in Central America during the 1980s, held several informal meetings with Iraqi officials prior to the June 13 terrorist attack on the revered Shia shrines in Samarra, the source said.
During his meetings, Negroponte reportedly strongly cautioned that the government of Iraqi Prime Minister Nouri al-Maliki must change. Press TV