The havoc, five days after the Taliban stormed the capital in a swift conquest that stunned American officials, attests to the terror inspired by the militants, as well as the logistical obstacles faced by the United States
com/en/definition/attest : to provide or serve as clear evidence of Thus, the havoc provides clear evidence of the terror (that is) inspired by the militants.
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"storm" = verb sense 2 at https://www.lexico.com/en/definition/storm: to suddenly attack and capture (a building or other place) by means of force
"attest" = verb sense 1 at