Turkey says agrees deal with U.S. on air support for Syrian rebels

ISTANBUL (Reuters) - The United States and Turkey have agreed "in principle" to give air support to some forces from Syria's mainstream opposition, Turkey's foreign minister said, in what if confirmed could mark an expansion of U.S. involvement in the conflict.

There was no immediate comment from U.S. officials on the assertion -- though Washington has so far refrained from committing to enforcing a "safe zone" for Syrian rebels, as it could be seen as a declaration of war on the Syrian state.