DAMASCUS, Syria — In the city of Hamouriya in eastern Ghouta, Rif Dimashq governorate, Jan. 23 was no ordinary day. Syrian military aircraft attacked a crowded marketplace and killed 60 civilians, including children and women. Afterward, the market was hit by mortar shells in the heaviest bombardment in the city since the Hamouriya massacre on Feb. 20, 2013, which resulted in the deaths of 100 civilians.