Turkish President Recep Tayyip Erdogan on Wednesday accused the United States of creating a "pool of blood" in the region by failing to recognise the main Syrian Kurdish organisations as terror groups.

"Hey America... As you have never recognised them (as terror groups) the region has turned into a pool of blood," Erdogan said in a lacerating attack on US policy, referring to the Syrian Kurdish Democratic Union Party (PYD) and its People's Protection Units (YPG) militia.