A new surge of Syrian refugees is swamping humanitarian aid agencies in southern Turkey, where official refugee camps are full.
But the newcomers may be just the tip of the iceberg. In central Syria, civilians under attack by combat jets, tanks and artillery have fled towns and villages north of the city of Hama, and thousands are on the move.
"What they do now, they burn everything ahead of them. They bomb this area with everything they've got," says Hossan Hamadah, a Syrian-American from Texas.