The official Syrian Arab News Agency, known as SANA, said the aircraft, flying low and fast, violated Syrian airspace over the Mediterranean Sea and was shot down by ground fire. It said the plane was hit about half a mile from the Syrian coast and crashed into the sea.
The incident appears to be another example of how the Syria conflict has elevated regional tensions. Syria sits in the heart of the volatile Middle East and its instability has already had ramifications in Turkey, Lebanon and elsewhere.
Erdogan’s office said Turkey would act “decisively” once all the details of the incident emerged. It did not specify what action it might take, or whether it would act alone or in concert with itsÂ NATOÂ allies.
Erdogan earlier told reporters that Turkish and Syrian authorities had launched a search for the pilots focused on a point in the Mediterranean about eight miles off the Syrian port of Latakia.
Turkey has joined the United States and other allies in calling for Syrian PresidentÂ Bashar AssadÂ to step down in the face of a rebellion that is now more than a year old.
The Turkish-Syrian border, which is more than 500 miles long, has become increasingly tense, as tens of thousands of refugees have fled the fighting in Syria and taken up residence in camps on the Turkish side.
Several cross-border shooting incidents have been reported in recent months, and Syria has called the border zone an entry point for weapons destined for Syrian rebels. Turkey has denied reports that it has sold arms or facilitated arms transfers to Syrian insurgents.