Syrian insurgents captured four new towns early Tuesday, bringing them closer to the central city of Hama, opposition activists said, while government forces retook some territory they lost last week.

A war monitor, the Syrian Observatory for Human Rights, said the insurgents led by Hayat Tahrir al-Sham seized control of Aleppo International airport, the first international airport to be controlled by insurgents. The fighters claimed they seized the airport and posted pictures from there.