ANKARA - Turkey could face an influx of 2-3 million more Syrian refugees if President Bashar Assad's forces or Islamic State insurgents advance around Aleppo, Turkish Foreign Minister Mevlut Cavusoglu said on Tuesday.US warplanes have been bombing Islamic State forces in parts of Syria, but Assad's military has intensified its campaign against some rebel groups in the west and north that Washington sees as allies, including in and around Aleppo."Right now who is filling the void left by IS as a result of the coalition's air attacks? It is the regime," Cavusoglu told a news conference in Ankara."But there is not that much difference between the IS and the regime. Both kill cruelly, especially civilians. And neither hesitate to use whatever weapons are available to them."