"Samples have been taken from people wounded in Syria who have been transported to Turkey," the source said on condition of anonymity, adding that the results were not yet known.
Western nations have raised concerns about the use of chemical weapons in the escalating conflict between the regime of President Bashar al-Assad and rebels fighting to oust him.
Top UN rights investigator Carla del Ponte said yesterday that according to testimony, rebels have been using sarin gas.
Turkish Prime Minister Recep Tayyip Erdogan, a one-time Syria ally, yesterday branded Assad a "butcher" and a "murderer" who would pay a heavy price for the killings in Syria.
