Turkish authorities have arrested four individuals in Istanbul in connection with a bomb attack targeting security forces in the city that killed 11. Turkey's Anadolu agency reported the four were arrested by anti-terror police following the explosion during rush hour in Istanbul's Vezneciler district on 7 June.
Seven of those killed in the attacks were members of the Turkish security forces, after the assault appeared to target a bus carrying riot police in the historic area of the city.
Istanbul Governor Vasip Sahin said at least three of the wounded were in a serious condition, according to the Associated Press.
The injured were taken to nearby hospitals, local media reported, as businesses in the vicinity of the bomb blast, which had suffered some superficial damage, were evacuated.
There were reports of gunfire in the historic Istanbul district in the immediate aftermath of the blast. In response to a perceived ongoing threat, police have set up a perimeter in the surrounding area, closed it to traffic and shut nearby metro stations.
Bomb disposal units were called to Vezneciler over fears of a secondary explosion. A suspicious white van was said to have been seen nearby to where the explosion took place.
While no individual group has claimed responsibility for the blast, Turkey has suffered a series of attacks from Islamist militants and Kurdish separatists in recent months. Islamic State (Isis) claimed two suicide bombings in tourist areas of Istanbul that killed 10 and four people in January and March respectively.
In the wake of this morning's attacks, Turkish authorities have placed a blackout on distribution of any material concerning the aftermath and investigations into the blasts.
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Police officers and rescuers inspect the site of a bomb attack that targeted a police bus in the Vezneciler district of IstanbulAFP/Getty Images
Police officers and rescuers inspect the site of a bomb attack that targeted a police bus in the Vezneciler district of IstanbulAFP/Getty ImagesPolice officers and rescuers inspect the site of a bomb attack that targeted a police bus in the Vezneciler district of IstanbulAFP/ Getty ImagesPolice secures the area near the site where a Turkish police bus was targeted in a bomb attack in a central Istanbul districtOsman Orsal/ ReutersPeople stand beside beside a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersPolice secures the area near the site where a Turkish police bus was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersA policeman reacts near a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersFire engines stand beside a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersAn armoured vehicle drives near a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersA policeman uses his phone near a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersA policeman reacts near a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersA destroyed van is pictured near a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersFire engines stand beside a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersA destroyed van is pictured near a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersPeople stand beside beside a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ ReutersFire engines stand beside a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, TurkeyOsman Orsal/ Reuters
