Meanwhile, the US also condemned the attack. "The United States strongly condemns the act of violence that took place today in Istanbul, Türkiye," said a statement by Karine Jean-Pierre, White House press secretary.
"Our thoughts are with those who were injured and our deepest condolences go to those who lost loved ones. We stand shoulder-to-shoulder with our NATO Ally Türkiye in countering terrorism," it added.
The foreign ministries of Pakistan, Jordan, Egypt, Saudi Arabia, Germany, India, Bosnia and Herzegovina and Greece also expressed condolences.
The Gulf Cooperation Council and President of Bosnia and Herzegovina's Republika Srpska entity Milorad Dodik also condemned the attack.
According to Istanbul Governor Ali Yerlikaya, the blast occurred at around 4.20 p.m. local time, with police and emergency officials cordoning off the scene.
Turkish President Recep Tayyip Erdoğan said that according to the initial information, the explosion could be a suspected act of terrorism and a woman played a role in it. "It smells like terrorism," he told a news conference before leaving for a G20 summit in Bali, Indonesia.