WASHINGTON

Six U.S. F-15E multi-role fighters has arrived at the Incirlik Air Base in Turkey increasing the number of F-15 fighters to 12, the Pentagon said Thursday. 

"These F-15Es join our manned and remotely piloted aircraft already conducting counter-ISIL missions from Incirlik alongside Turkish F-16s," Pentagon spokesman Peter Cook said. 

Cook announced earlier this week that last Friday six F-15C air-to-air fighters from the Royal Air Force Lakenheath, arrived at the site.

The U.S. also has a dozen A-10 warthog aircraft and Remotely Piloted Aircraft already conducting airstrikes against Daesh at Incirlik. 

"Turkey's role in counter-ISIL operations including the hosting of U.S. assets, participation in counter-ISIL air operations, cooperation to reduce the flow of foreign terrorist fighters, and support for the vetted Syrian opposition is critical to our collective efforts to bring stability to the region." Cook said, using an alternative acronym for the Daesh militant group.