The arrest documents include pictures of a woman, her face almost totally obscured by a mask, setting fire to unmarked police vehicles.
"This defendant was captured by multiple cameras using an accelerant, lit like a blowtorch, to start fires in five vehicles — putting the public at risk and creating the very real possibility of a structure fire amidst the throng of people protesting downtown," said U.S. Attorney Brian Moran.
In making the arrest, they compiled several pictures and videos from surveillance cameras, broadcast news video and social media posts, and from Seattle Police themselves.
The criminal complaint goes into great detail about how investigators compared the tattoos on her fingers, the clothes she was wearing — as well as her distinctive eyebrows.
"She has both tattooed eyebrows and natural eyebrows, with the two failing to line-up perfectly," the documents claim.
"This results in uneven eyebrows that are thicker and thinner in certain places and are thus irregularly shaped. Specifically, the tattooed portion of Channon's right eyebrow has a steep, sharp peak that is not seen on her left eyebrow."