The Turkish army early on Saturday returned fire after a new round of shelling from Syria hit the border province of Hatay, the Anatolia news agency reported.
No casualties were reported, the agency said.
The incident on Saturday happened in the small Turkish village of Guvecci, near the border with Syria, when a mortar fell in a rural area. It came from across the border in Syria in a region where fighting has taken place between rebels and the Syrian army, Anatolia said.
The latest exchange came three days after Syrian shelling killed five Turkish nationals in another border town, Akcakale, triggering retaliatory fire and ratcheting up the tense relations between the neighbours.