Islamic State militants have reportedly seized the last border crossing between Iraq and Syria that was under Iraqi security forces control, Sunday. The al-Waleed border crossing (known as al-Tanaf on the Syrian side), which is just to the south of Palmyra, a UN World Heritage site that purportedly fell under the complete control of IS on Thursday.the video is muted COURTESY: RT's RUPTLY video agency, NO RE-UPLOAD, NO REUSE - FOR LICENSING, PLEASE, CONTACT http://ruptly.tvRT LIVE http://rt.com/on-airSubscribe to RT! http://www.youtube.com/subscription_center?add_user=RussiaTodayLike us on Facebook http://www.facebook.com/RTnewsFollow us on Twitter http://twitter.com/RT_comFollow us on Instagram http://instagram.com/rtFollow us on Google+ http://plus.google.com/+RTListen to us on Soundcloud: https://soundcloud.com/rttvRT (Russia Today) is a global news network broadcasting from Moscow and Washington studios. RT is the first news channel to break the 1 billion YouTube views benchmark.