Turkish EU Affairs Minister Omer Celik on Wednesday accused German Foreign Minister Sigmar Gabriel of copying the "far-right and racists" in his statements in an ongoing diplomatic crisis with Turkey.

"Gabriel is not making original statements. He speaks by 'copying' from the far-right and racists," Celik wrote on Twitter in a tirade of 29 tweets criticising Gabriel and his Austrian counterpart Sebastian Kurz, as the row between Ankara and Berlin showed no signs of slowing.