Malian masons Friday began rebuilding mausoleums in the historic city of Timbuktu destroyed by Islamists during their occupation of the country's north, the United Nations said.

The earthen tombs of saints, located in the UNESCO listed desert city, were destroyed in July 2012 by militants who considered the local Sufi version of Islam to be idolatrous. Thousands of ancient manuscripts were also burned.

Located on an old Saharan trading route that saw salt from the Arab north exchanged for gold and slaves from black Africa to the south, Timbuktu blossomed in the 16th century as an Islamic seat of learning, home to priests, scribes and jurists.