ANKARA (Reuters) - Turkish security forces returned fire into Syrian territory controlled by a Kurdish militia on Monday and killed one member of the group, Turkey's armed forces said on Tuesday.

It said the clash occurred at a border post in the Nusaybin area of Mardin province in southeast Turkey, across the border from an area controlled by the YPG militia. Ankara regards the Syrian group as closely tied to militants who have fought a three-decades-old conflict within Turkey.

(Reporting by Orhan Coskun; Writing by Daren Butler; Editing by David Dolan)