Video footage shows the aftermath of this morning's explosion at Istanbul's historic Sultanahmet district.
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.
Turkish security officials are now saying there's a high probability that IS is responsible for this morning's explosion in Istanbul.
There are some horrifying eye witness accounts coming out of Istanbul following this morning's blast.
Witnesses told CNN Turk that the explosion had taken place at the heart of Sultanahmet district, close to an ancient obelisk, and that several people had been seen on the ground after the attack.
Erdem Koroglu, a worker at a nearby office, told the television station NTV that he saw several people on the ground after the blast.
“It was difficult to say who was alive or dead,” Mr. Koroglu said. “Buildings rattled from the force of the explosion.”
A Norwegian man was among those injured in the blast at Sultanahmet this morning, says Reuters' Ece Toksabay.
Turkey's President Recep Tayyip Erdogan says that the blast in Istanbul this morning was carried out by a suicide bomber of Syrian origin, Hurriyet reports.
The UN's refugee agency says that land mines pose a threat to children who have been going out to collect grass to eat in the besieged Syrian town of Madaya.
Humanitarian groups are negotiating with all sides for the evacuation of 400 people, many starving, from the besieged Syrian town of Madaya, the Red Cross has said.
The United Nations, the International Committee of the Red Cross (ICRC), and the Syrian Arab Red Crescent are now working to evacuate around 400 people in need of urgent care, said ICRC spokesman Pawel Krzysiek.
"It's a very complicated process that needs permission to realize this humanitarian operation. We are in negotiations with all parties," Krzysiek told AFP.