United States Vice President Joe Biden has issued an apology to Turkish President Recep Erdogan for saying that the Turkish leader allowed some Islamic State of Iraq and the Levant (ISIL) fighters to cross into Syria.

The vice president's apology came after Turkey's leader expressed his disapproval over the remark's to Turkish reporters, saying Biden has to apologize, or he "will become history to me."

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The United Arab Emirates (UAE) also demanded an explanation for Biden's statement.

On Saturday, Biden's spokeswoman, Kendra Barkoff, released a statement saying the U.S. vice president was sorry for implying that Turkey and other Middle Eastern allies had intentionally sent supplies to the Islamic State militants in Iraq and Syria.

According to Barkoff, Biden has reaffirmed that the United States is grateful to Turkey and other allies, for its support in battling the terror group.

In addition, the spokeswoman announced that Biden and Turkey's leader have reaffirmed their countries' commitment towards combating ISILduring a telephone conversation.

The issue began when Biden spoke about the UAE and other Middle Eastern allies, including Turkey, regarding the threat posed by the Islamic State Militants at Harvard University's John F. Kennedy School of Government.

According to the vice president, Middle Eastern allies were partly to blame for the strengthening of the militant group because of their support of the forces fighting against Syrian President Bashar al-Assad.

Instead of providing artillery to anti-Assad forces, the supplies given by its allies were actually getting into the hands of jihadist groups around the world, including the al-Nustra and al-Qaeda, Biden said.

"We could not convince our colleagues to stop supplying them," the U.S. vice president said.

In addition, Biden recounted how Erdogan told him that Turkey has let "many people through" who are now trying to "seal their border." The Turkish president, however, denied Biden's story.

TagsJoe Biden, Turkey, ISIS, offensive comment, U.S. allies, ISIL, Daesh