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In this image released by the Egyptian Presidency, Iran's President Mahmoud Ahmadinejad, center, and Egyptian President Mohammed Morsi, center right, participate in an arrival ceremony at the airport in Cairo, Egypt, Tuesday, Feb. 5, 2013. Ahmadinejad arrived in Cairo on Tuesday for the first visit by an Iranian leader in more than three decades, marking a historic departure from years of frigid ties between the two regional heavyweights.(AP Photo/Egyptian Presidency)

In this image released by the Egyptian Presidency, Iran's President Mahmoud Ahmadinejad, right, looks on as and Egyptian President Mohammed Morsi, second right, shakes hands with the Iranian delegation at the airport in Cairo, Egypt, Tuesday, Feb. 5, 2013. Ahmadinejad arrived in Cairo on Tuesday for the first visit by an Iranian leader in more than three decades, marking a historic departure from years of frigid ties between the two regional heavyweights.(AP Photo/Egyptian Presidency)

Iran's President Mahmoud Ahmadinejad, left, shakes hands with Grand Sheik Ahmed al-Tayeb, the head of Al-Azhar, the Sunni Muslim world's premier Islamic institution during their meeting at Al Azhar headquarters in Cairo, Egypt, Tuesday, Feb. 5, 2013. Once close, Egypt and Iran severed their relations after the 1979 Islamic Revolution when Cairo offered exile to Iran's deposed shah. Relations further deteriorated after Egypt's peace treaty with Israel. (AP Photo/Amr Nabil)

Iran's President Mahmoud Ahmadinejad, center, attends a press conference with Egyptian Sunni clerics at Al-Azhar headquarters in Cairo, Egypt, Tuesday, Feb. 5, 2013. Egypt's most prominent Muslim cleric, the sheik of Al-Azhar, has warned Iranian President Mahmoud Ahmadinejad against interfering in Arab Gulf countries or trying to spread Shiite influence. Ahmadinejad, on a landmark visit to Egypt on Tuesday, received an uneasy reception from Ahmed el-Tayeb at Al-Azhar, the Sunni Muslim world's foremost Islamic institution. (AP Photo/Amr Nabil)

Iran's President Mahmoud Ahmadinejad speaks at a news conference after visiting Sheikh Ahmed al-Tayeb, Egypt's leading Sunni Muslim scholar at the historic al-Azhar mosque and university, in Cairo February 5, 2013. Mahmoud Ahmadinejad was both kissed and scolded on Tuesday when he began the first visit to Egypt by an Iranian president since Tehran's 1979 Islamic revolution. The trip was meant to underline a thaw in relations since Egyptians elected an Islamist head of state, President Mohamed Mursi, last June. But it also highlighted deep theological and geopolitical differences. REUTERS/Mohamed Abd El Ghany

In this image released by the Egyptian Presidency, Iran's President Mahmoud Ahmadinejad, left, and Egyptian President Mohammed Morsi, center, meet in Cairo, Egypt, Tuesday, Feb. 5, 2013. Ahmadinejad arrived in Cairo on Tuesday for the first visit by an Iranian leader in more than three decades, marking a historic departure from years of frigid ties between the two regional heavyweights.(AP Photo/Egyptian Presidency)

Children stand in front of a poster of Iran's President Mahmoud Ahmadinejad in front of the Al-Hussein mosque, named after Prophet Mohammed's grandson Hussein ibn Ali, before Ahmadinejad's visit to the mosque in old Cairo February 5, 2013. Ahmadinejad was both kissed and scolded on Tuesday when he began the first visit to Egypt by an Iranian president since Tehran's 1979 Islamic revolution. The trip was meant to underline a thaw in relations since Egyptians elected an Islamist head of state, President Mohamed Mursi, last June. But it also highlighted deep theological and geopolitical differences. REUTERS/Amr Abdallah Dalsh

Iran's President Mahmoud Ahmadinejad (2nd L) shakes hands with a sheikh as he arrives in front of the Al-Hussein mosque, named after Prophet Mohammed's grandson Hussein ibn Ali, in old Cairo February 5, 2013. Ahmadinejad was both kissed and scolded on Tuesday when he began the first visit to Egypt by an Iranian president since Tehran's 1979 Islamic revolution. The trip was meant to underline a thaw in relations since Egyptians elected an Islamist head of state, President Mohamed Mursi, last June. But it also highlighted deep theological and geopolitical differences. REUTERS/Amr Abdallah Dalsh

Iran's President Mahmoud Ahmadinejad (2nd L) shakes hands with people as he arrives in front of the Al-Hussein mosque, named after Prophet Mohammed's grandson Hussein ibn Ali, in old Cairo February 5, 2013. Ahmadinejad was both kissed and scolded on Tuesday when he began the first visit to Egypt by an Iranian president since Tehran's 1979 Islamic revolution. The trip was meant to underline a thaw in relations since Egyptians elected an Islamist head of state, President Mohamed Mursi, last June. But it also highlighted deep theological and geopolitical differences. REUTERS/Amr Abdallah Dalsh

Iran's President Mahmoud Ahmadinejad, center, waves to Egyptian worshippers after he visits the shrine of Imam Hussein, the grandson of Islam's Prophet Mohammad, in Cairo, Egypt, Tuesday, Feb. 5, 2013. Egypt's most prominent Muslim cleric, the sheik of Al-Azhar, has warned Iranian President Mahmoud Ahmadinejad against interfering in Arab Gulf countries or trying to spread Shiite influence. Ahmadinejad, on a landmark visit to Egypt on Tuesday, received an uneasy reception from Ahmed el-Tayeb at Al-Azhar, the Sunni Muslim world's foremost Islamic institution.(AP Photo/Amr Nabil)

Iran's President Mahmoud Ahmadinejad, center, talks during a presser following his meeting with Grand Sheik Ahmed al-Tayeb, the head of Al-Azhar, the Sunni Muslim world's premier Islamic institution, not pictured, at Al Azhar headquarters in Cairo, Egypt, Tuesday, Feb. 5, 2013. Egypt's most prominent Muslim cleric, the sheik of Al-Azhar, has warned Iranian President Mahmoud Ahmadinejad against interfering in Arab Gulf countries or trying to spread Shiite influence. Ahmadinejad, on a landmark visit to Egypt on Tuesday, received an uneasy reception from Ahmed el-Tayeb at Al-Azhar, the Sunni Muslim world's foremost Islamic institution.(AP Photo/Amr Nabil)