“The U.S. Consulate General in Istanbul advises U.S. citizens that extremist groups are continuing aggressive efforts to attack Americans and/or other foreigners in Istanbul. These attacks may be pre-planned or could occur with little or no warning, and include, but are not limited to: armed attack, attempted kidnapping, bombing, or other violent acts. The Consulate General advises U.S. citizens residing in or visiting Istanbul to review and update their personal security practices when traveling to locations where westerners are known to frequent or reside," the statement said.
In particular, the consulate recommends the US citizens to avoid travel to southeastern Turkey, stay away from public gatherings, exercise vigilance in public places and monitor local media.