Mattis said, "This military facility was a Syrian center for the research, development, production, and testing of chemical and biological warfare technology."

The second target was a chemical weapons storage facility west of Homs, which Mattis said "was the primary location of Syrian Sarin and precursor production equipment."

Mattis said the third target "was in the vicinity of the second target" and "contained both a chemical weapons equipment storage facility and an important command post."