President Bashar al-Assad's forces appear to have evacuated most personnel from army and security command headquarters in central Damascus in preparation for a Western military strike, residents and opposition sources said on Wednesday, August 28, according to Reuters.

U.S.-led air or missile strikes on Syria look all but certain after the United States and European and Middle Eastern allies blamed a suspected poison gas attack that killed hundreds in the city on Aug 21 on President Bashar al-Assad's forces.

Army units stationed near the capital have confiscated several trailer trucks, apparently to transport heavy weaponry to alternative locations, though no significant movement of military hardware has been reported, possibly due to heavy fighting near major highways, one of the sources added.

Among the buildings that have been partially evacuated are the General Staff Command Building on Umayyad Square, the nearby airforce command and the security compounds in the Western Kfar Souseh districts, residents of the area and a Free Syrian Army rebel source said.

Syrian military authorities do not discuss troop movements publicly, and no government spokesman was available for comment.

The General Staff building, one of the top military headquarters in the country, has been operating with reduced staffing since it was attacked by rebel bombs in September 2012.