The decision has been made due to the high threat of terrorist attacks in Istanbul.
A car bomb exploded in Ankara on March 13, near a crowded bus stop. The explosion killed as many as 37 people, 125 more got injured.
Preliminary reports said the two suicide bombers, one male and one female triggered the explosive device, while in the car. According to reports, the mentioned car was hijacked Feb. 10 in the Turkish south-eastern province of Sanliurfa.
Istanbul police boost security due to high terrorism threat
15 March 2016
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Following the terrorist attack in Ankara on March 13, the Istanbul police have boosted security, Milliyet newspaper reported March 15.
