Syrian rebels fired machineguns mounted on the back of pick-up trucks into the air as jets flown by forces loyal to President Assad resumed bombing raids on the border town of Ras al-Ain.
The planes dropped three bombs, a Reuters witness said, before returning for a second strike on another part of the town, which is metres from Turkey.
The second day of bombings caused residents on the Turkish side to scurry for cover.
Thousands more refugees pour across the border to escape the war in Syria, whilst Turkey says the conflict is threatening their security.
A suggestion that David Cameron has gone "out on a limb" over Syria has been rejected by his official spokesman.