U.N. counts 3 million Syria refugees
ISIS boasts of mass execution in Syria
- NEW: U.N.: 44 peacekeepers seized near Golan Heights "are safe and in good health"
- U.N.: 3 million have left Syria during civil war; 6.5 million others are internally displaced
- Almost half of all Syrians forced to leave their homes, agency says
- More than 80% of refugees are struggling to make a living, U.N. says