Turkish President Recep Tayyip Erdogan on Wednesday, February 10 accused the United States of creating a "pool of blood" in the region by failing to recognize the main Syrian Kurdish organizations as terror groups, AFP reports.

"Hey America... As you have never recognized 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.

His remarks escalated a growing row between Washington and key NATO member Turkey over the role of Kurdish fighters in the struggle against jihadists in Syria.

Turkey on Tuesday summoned the US envoy to Ankara in protest after the US State Department spokesman said that Washington did not recognise the PYD as a terror group and would continue to support its operations in Syria.

"Hey America! How many times have we had to tell you?" Erdogan said in his fiery address. "Are you together with us or are you with the PYD and YPG terror groups?"

"Is there a difference between the PKK and the PYD? Is there a difference with the YPG?" asked Erdogan, according to AFP.

"We have written proof! We tell the Americans “it's a terror group”. But the Americans stand up and say 'no we don't see them as terror groups'."