A clash between Syrian rebels and troops spilled over the border, leaving one dead and several injured. Turkey summoned Syria's envoy over the clash.
Meanwhile a Lebanese cameraman was shot dead on Lebanon's Syrian border.
The violence comes amid fading hopes that a UN-brokered Syria ceasefire will start on Tuesday as planned.
Clashes have continued in Syria despite the truce deal, which requires Syrian troop withdrawals from towns and cities.
The Associated Press news agency quoted Gaziantep provincial Governor Yusuf Odabas as saying that one Turkish translator and a Turkish policeman were among those hurt.
A Turkish foreign ministry official told Reuters: "After this incident the Syrian charge d'affaires in Ankara was called and we demanded an end to this."