Officials in Turkey say the military has returned fire across the border after a Syrian mortar round again landed on Turkish soil.
The incident happened in the southern Turkish province of Hatay on the afternoon of October 5.
No one was reported hurt.
The shelling came hours after Prime Minister Recep Tayyip Erdogan renewed a call for Syria not to test Turkey's capacity for deterrence, saying it would be "a fatal mistake."
On October 3, Syrian mortar fire killed five civilians in a Turkish border town.
In retaliation, Turkish artillery has fired at Syrian targets for two straight days.
Meanwhile, Turkey's parliament voted on October 4 to authorize troops to launch cross-border operations against Syria and strike at Syrian targets for a period of one year.
Based on reporting by AP and Reuters