International inspectors have so far visited three sites linked to Syria's chemical weapons program, a spokesman said Thursday, as the team races to destroy the country's stockpile and delivery systems amid a raging civil war.

Underscoring the complexity of the mission, a regime warplane bombed the rebel-held town of Safira, an activist group said. A regime-controlled military complex believed to include chemical weapons facilities is located near the town.

The inspectors are to visit more than 20 sites around the country as part of the disarmament mission. The facilities they inspected in the past 10 days have been in government-held areas, making them fairly easy to reach, said Michael Luhan, spokesman for the Organization for the Prohibition of Chemical Weapons.