Turkish security authorities believe an "IS-linked suicide bomber" was behind the explosion in Sultanahmet, Hurriyet has reported.
Hurriyet says the authorities are focussing on IS links because tourists and civilians were targeted in a major tourist area.
Video footage shows the aftermath of this morning's explosion at Istanbul's historic Sultanahmet district.
Here is a summary of this morning's events in Istanbul's central Sultanahmet Square:
- An explosion occurred in Sultanahmet Square at around 10:20 local time this morning.
- Ten people have been killed and 15 more are reported injured, the Istanbul governor's office says
- The explosion happened in a major tourist area close to Istanbul's Blue Mosque and Hagia Sophia.
- No one has claimed responsibility for the explosion and there is speculation that it could have been a suicide bombing.
- Turkey imposed a temporary media ban on reporting from the area.
- Germans, a Norwegian and a Peruvian are among those injured.
- Germany's Foreign Ministry has warned Germans to avoid crowded areas near tourist attractions in Istanbul.
- Turkish Prime Minister Ahmet Davutoglu has convened an emergency security meeting of key ministers and officials.
Turkish Prime Minister Ahmet Davutoglu is set to attend a security meeting in Cankaya Palace, the former presidential palace, with Deputy Prime Minister Numan Kurtulmus, Interior Minister Efkan Ala, Foreign Minister Mevlut Çavuşoglu and officials from National Intelligence Organization (MİT) and the the Security General Directorate (EGM), Today's Zaman reports.
Germany has warned its nationals to avoid tourist sites in Istanbul following this morning's blast that killed ten people.
A TV report has said that a suicide bomber was responsible for the blast this morning in Istanbul, AP are reporting.
Two hours after the blast in Turkey's Sultanahmet district, Wall Street Journal reporter Ayla Albayrak says that tourists are still on the streets.
Istanbul's Blue Mosque has been completely closed off, says freelance journalist Zia Weise.