Turkish military strikes targets inside Syria
Retaliation follows mortar attack from Syrian territory that killed family of five in border town of Akcakale.
Turkish armed forces have launched artillery attacks against Syria in response to a mortar attack which killed five members of the same family in southeastern Turkey.
In a statement on Wednesday, Recep Tayyip Erdogan, Turkey's prime minister, said the attacks, carried out following radar tracking, were within the rules of engagement.
Separately, Bulent Arinc, deputy prime minister, said: "There has been an attack on Turkey's mainland and its citizens lost their lives. There is definitely a response to it in international law ... We are not blinded by rage but we will protect our rights to the end in the face of such an attack on our soil that killed our people."
Al Jazeera's Andrew Simmons, reporting from Antakya on the Turkish-Syrian border, said Arinc's mention of "certain responsibilities" contained within NATO treaty articles, could mean that Turkey responded without consulting international bodies first.
The Syrian Observatory for Human Rights said: "several shells from the Turkish side of the border fell on Syrian military
positions near the village of Tal al-Abyad".
Western officials, from Anders Fogh Rasmussen, NATO secretary-general, to Hillary Clinton, US secretary of state, quickly condemned the initial attack from the Syrian side of the border, which struck a house in the border town of Akcakale.
Omran Zoabi, Syrian information minister, said Damascus was looking into the origin of the deadly cross-border shelling.
In a statement reported by state television, Zoabi said: "Syria offers its sincere condolences to the families of the victims and to our friends the Turkish people".