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 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.”
Three Israeli tourists were among those injured, local media report say. The Israeli foreign ministry has confirmed Israelis were wounded, but has not given the number or said what condition they are in.
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