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A suicide bomb attack at a busy shopping area in the Turkish city of Istanbul has killed at least four people, officials say.
Another 36 were injured - 12 foreign nationals - as the bomb went off near a government building on Istiklal Street.
No-one has admitted carrying out the attack, the latest to target Turkey in recent months.
The Turkish government has blamed Kurdish militants for previous attacks and has retaliated against them.
Saturday's attack in Istanbul - Turkey's largest city - occurred at about 11:00 local time (09:00 GMT).
Uwes Shehadeh was some 500m (1,640ft) away when he heard "a horrific and horrible noise".
"People didn't know what was going on. It was very chaotic. Everyone was screaming and running away," he told the BBC.
"Istanbul is on high alert and people are very worried as to what will happen next."
Among the foreigners injured were: six Israelis, two Irish citizens, and one national from Germany, Iceland, Dubai and Iran.
Both the so-called Islamic State (IS) and Kurdish militants have claimed recent attacks in Turkey.
President Recep Tayyip Erdogan has said terror groups are targeting civilians because they are losing their struggle against Turkish security forces.
Turkey is part of the US-led coalition against IS and allows coalition planes to use its air base at Incirlik for raids on Iraq and Syria.
At the scene: Rengin Arslan, BBC News, Istanbul
"Let's not meet outside", is what many were saying to each other in Istanbul, after the suicide bombing in the heart of Ankara less than a week ago. Concern and caution travel fast between Turkish cities.
On Thursday and on Friday, Germany closed its consulate near Istiklal Street, because of a security threat. Istanbul's local government underestimated the German concern. Unfortunately, the Germans have been proved right.
Istiklal Street is a popular place for locals and tourists to gather. Now people from different backgrounds share the same fear.
Turkey has never witnessed successive suicide bombings like this before. It is hard to take in what is happening and harder to see what may come next. In this limbo, fear and worry come and go - or stay.
It has also been carrying out a campaign of bombardment against Syrian Kurdish fighters of the People's Protection Units (YPG), which it regards as a extension of the outlawed Kurdistan Workers Party (PKK).
A two-year-old ceasefire between Turkey and the PKK broke down last summer.
Since then, more than 340 members of Turkey's security forces have been killed along with at least 300 Kurdish fighters and more than 200 civilians.
Recent attacks in Turkey
March 2016: 35 people killed by Kurdish militants in Ankara
February 2016: 28 killed in military convoy in Ankara
January 2016: 12 German tourists are killed in a suspected IS suicide bombing in Istanbul
October 2015: More than 100 people are killed in a double suicide bombing at a Kurdish peace rally in Ankara