TABLE 1.

Source-of-information categorizations under the SSA

Certainty-level category	Category description
Rumor	Social media post (Twitter or Facebook) Hearsay Form submission from anonymous source
Possible	Media report from local or international news source Communication from an organization not defined in the partner group that an attack has been made against them
Probable	One eyewitness accounts of the attack as told to one or more SSA partner(s) Two secondary accounts (not eyewitnesses) of the attack as told to one or more SSA partner(s)
Confirmed	Communication from an SSA partner that an attack has been made against them One eyewitness account by someone from the SSA partner group Two eyewitness accounts of the attack as told to one or more SSA partner(s) Types and sources of information that would be graded as “probable,” plus a photo, video, or satellite image of the attack or its aftermath, or an international media or police report that provides clear evidence of the attack