Syrians in the country's rebel-held north on Monday marked the 10-year anniversary of chemical attacks that killed more than 1,400 people near Damascus, one of the conflict's many horrors that went unpunished."I was in such shock. I smelt death," said Mohammed Sleiman, a paramedic from Zamalka in Eastern Ghouta who lost five members of his family that day.On August 21, 2013, regime forces attacked Eastern Ghouta and Moadamiyet al-Sham, rebel-held areas outside the capital.