GENEVA -- The United Nations says 2.8 million Syrian children cannot go to school because of a civil war now entering its fourth year.

The UN children's agency says 2.3 million of Syria's nearly 5 million school-age children are out of school as education and health services collapse, and classrooms are bombed or used as shelters and military barracks.

UNICEF says another 300,000 Syrian children are out of school in Lebanon, along with some 93,000 in Jordan, 78,000 in Turkey, 26,000 in Iraq and 4,000 in Egypt.

Agency officials told reporters Tuesday in Geneva that 2 million children affected by the fighting are in need of psychological support or treatment.