Following attacks, Ankara has retaliated with a measured response and warned the regime of severe 'punishment' if its forces are targeted again in future.
The Istanbul Metropolitan Municipality has made huge investments to develop its metro systems, we take you on a tour of where it stands, and which directions it's going in.
Istanbul's first automated metro system on the city's Anatolian side is serving close to 200,000 passengers a day, according to Metro Istanbul.
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