There have been many reports that IS is funded indirectly or directly through Saudi Arabia, the Gulf Cooperation Council (GCC). The Saudi GCC coalition has been bombing Yemen since March 26; they are backed by the Pentagon. They have of course had access to US intelligence resources, refilling technology and the State Department has even said they think that the government of ousted fugitive President Hadi, who is now based in Riyadh, is the legitimate regime in Yemen. So it’s not surprising that IS would be taking the same position as the Saudi GCC alliance as well as the US.