Introduction and Methodology
On Tuesday, April 4, 2017, Syrian regime forces carried out a chemical attack against the residents of Khan Sheikhoun city. It was the largest chemical attack since the Damascus suburbs attack in August 2013. The U.S. Department of Defense said, in a statement, that at 04:40 on Friday, April 7, 2017, the USS Porter and USS Ross guided-missile destroyers had launched 59 Tomahawk missiles, targeting al Shayrat Airbase in eastern Homs governorate, which contains chemical substances warehouses.

Al Shayrat Airbase is located on Homs – Tadmor road about 31 kilometers into the southeast of Homs city. It is considered one of the most important airbases for the Syrian regime in its military operations, and in bombing civilian neighborhoods and committing massacres. It is also the second most used airbase by Russian warplanes after Hmeimim Airbase in the suburbs of Latakia governorate.
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