President Rouhani arrived in Istanbul late on Wednesday in order to take part at the Organisation of Islamic Cooperation Summit. Dr Rouhani is set to deliver a speech on the first day of the summit. Upon his arrival at the Istanbul airport, President Rouhani was welcomed by Turkish Economy Minister Mustafa Elitaş, Iranian Foreign Minister Dr Mohammad Javad Zarif and Iranian Ambassador to Ankara. The 13th Summit of the Organisation of Islamic Cooperation is scheduled to kick off on April 14 and 15 in Istanbul. Combatting terrorism and extremism is one of the issues to be discussed in the summit.