Talabani, 71, a Kurdish leader and head of the Patriotic Union of Kurdistan, took the oath on the Holy Koran at a ceremony held in the heavily-guarded Green Zone in central Baghdad and amid strict security measures.
At the same time, Talabani's two deputies, Adel Abdel Mehdi, a Shiite and Ghazi al-Yawer, the Sunni former transitional president, were also sworn in.
Prime minister-designate Jaafari has a period of two weeks to form the new government from the day he is officially appointed.
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