Another example of OSINT, notably satellite photos and videos, can help to explain events. 'Brown Moses' helped too:
Today marks the first anniversary of one of the biggest air strikes that has been conducted inside Syria, and particularly in the country's third largest city's of Homs, on a strategic Syrian army arms depots. .....Many believed that the attack in Homs on Aug. 1st, 2013, was carried out by Syrian armed opposition groups, launching Grad rockets towards the strategic arms depots of the Syrian army, resulting in a massive explosion that rocked the entire city of Homs.

Today and after almost a year after that strike, a number of never released before satellite photos revealed for the first time that the target was not the arms depots, rather a secret underground chemical weapons storage facility south of Homs.
Link:http://www.businessinsider.com/israe...#ixzz398mH7FT0

Note this was a year ago today and citing in part the conclusion:
This incident also suggests that Israel targeted the Syrian chemical weapons program at least once before the August 21st Sarin attacks in Damascus.