Turkey’s prime minister says his country has no intention of going to war with Syria, as protesters worried about an escalation of the cross-border violence marched through Ankara and Istanbul.
In the capital there were some clashes between protesters and police.
Turkey has attacked targets in Syria after a mortar bomb fired from Syrian territory struck a Turkish border town.
Parliament approved further possible military action outside Turkey’s borders.
However the prime minister said the aim of the move was to deter further attacks, warning that his country’s determination should not be tested.
“We only want peace and security in our region. This is what we care about. We have no intention of war,” Recep Tayyip Erdoğan said.
Turkey had already increased its military presence along the border after previous shelling from the Syrian side.
The military response has been backed by the US which said Turkey was trying to protect its sovereignty. The UN Secretary General expressed alarm at the escalating tension and called for maximum restraint.
In Akcakale on the Turkish-Syrian border the funerals have taken place of those killed by the Syrian shell.
A mother, her sister and her three children died. At least 10 others were injured.
The attack has heightened a sense of insecurity and sparked international concern over a possible escalation of the conflict.