Security forces cordoned off the mosque building, people were checked using special detectors.
Early, the US Embassy in Turkey has warned its citizens of a possible terrorist attack in Gaziantep province.
More than 50 people were killed in a suicide attack in Gaziantep on August 21.
Earlier, Turkish media reported that militants of the terrorist organization IS use Turkish province of Gaziantep on the border with Syria as a reference point, noting that there are `schools` related to the IS in Turkey.
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