Turkish police arrest Istanbul bombing suspect

• "Our assessment is that the order for the deadly terror attack came from Ayn al-Arab in northern Syria, where the PKK/YPG has its Syrian headquarters," Soylu said, according to the Guardian.

What they're saying: "It would be wrong to say this is undoubtedly a terrorist attack but the initial developments and initial intelligence from my governor is that it smells like terrorism," Erdoğan said at a press conference ahead of his departure for the G20 summit in Indonesia.

• "Our people can rest assured that the culprits behind the attack will be punished as they deserve," Erdoğan added.

Details: Witnesses told Reuters that the blast sent people running as flames erupted after the explosion. "When I heard the explosion, I was petrified, people froze, looking at each other. Then people started running away. What else can you do," Mehmet Akus, a 45-year-old restaurant worker, told the news agency.

• Al Jazeera reported there had been no major warnings of a possible attack in the area, which typically has high security measures in place.
• Of note: Turkey was hit by a string of deadly attacks by ISIS and outlawed Kurdish separatist groups between 2015 and 2017.

Editor's note: This article has been updated with new details throughout.