The Syrian military has said that it shot down a Turkish warplane "flying in airspace over Syrian waters".

A spokesman said the plane, an F-4 Phantom, was dealt with "according to the laws that govern such situations", the state news agency Sana said.

The Turkish prime minister said his country would "take the necessary steps" once all the facts were known.

The Turkish and Syrian navies are meanwhile engaged in a joint search for the two missing crew members.