Turkey has asked the U.S. to help track down the Chechen leader of an Islamic State combat battalion in the belief that he organized the deadly attack on Istanbul’s airport, a senior U.S. official said. The operative, Akhmed Chatayev, is well known to U.S. and Russian intelligence officials, and his Syrian-based, Russian-speaking fighters are considered a sophisticated branch of the terrorist group. Last year the U.S. Treasury put...

Source: Wall Street Journal July 02, 2016 11:27 UTC