Hurriyet Turkish newspaper said that security forces have seized a truck laden with weapons bound for Syria and arrested three people including a Syrian in the southern province of Hatay on the Syrian border.
A significant quantity of ammunition and weapons were discovered in the truck, whose drivers claimed they were carrying aid on behalf of the pro-Islamic Humanitarian Relief Foundation (IHH).
But IHH dismissed the allegations as "slanderous", saying that "the organization has nothing to do with this case".
In December, local media reported that Turkey had shipped 47 tonnes of weapons to the rebels since June.
But Defence Minister "Ismet Yilmaz" denied weapons of war had been sent to Syria, saying only hunting rifles had been exported.