Turkish media have said that Russian, Uzbek and Kyrgyz nationals took part in the assault
The shootings follow a terror attack on Istanbul's Ataturk airport.
At least 36 people were killed and more than 140 injured in the blasts.
Second video shows bomber shot and writhing on ground before detonating second explosion.
Out of the 11 fatal terrorist incidents in Turkey this year 8 have killed civilians.
Early reports suggest that three attackers simultaneously targeted separate parts of the airport.
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The attacks were said to pre-empt a Daesh attack following months of rocket attacks.
The Syrian Observatory for Human Rights says six of the casualties were from the same family.
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Attack on police bus killed 11 people.
According to reports the explosion rocked the frontier town, with several people injured.
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The four were taken in for questioning by Turkey's anti-terror police, state news reported.
Turkey were minutes away from reaching the final last time they made the Euros.
The explosion occurred near a bus stop in the city's Vezneciler district.