International Atomic Energy Agency head Mohamed ElBaradei arrived in Tehran on Thursday night.
He is to meet Iranian President Mahmoud Ahmadinejad, chief nuclear negotiator Saeid Jalili, atomic organization chief Gholam-Reza Aqazadeh and Foreign Minister Manouchehr Mottaki.
The aim of the visit is to clarify all outstanding issues regarding Iran's nuclear projects. ( Dpa )