Education is compulsory and free for all children from ages 7 through 15. Secondary education is also free. Wartime destruction or damage to schools disrupted education for many children, although “war schools” were created in other buildings. There are officially four universities in the country, in Sarajevo, Banja Luka, Tuzla, and Mostar. The university in Mostar, however, has split into two unrelated institutions, a Croat university in western Mostar and an Islamic one in eastern Mostar.