The FBI managed to track down the women, identified by police as Lore-Elisabeth Blumenthal, 33, through purchases she made on Etsy and her LinkedIn profile.
Authorities said in a criminal complaint, obtained by ABC News, they sifted through numerous videos and photos of people setting two vehicles on fire at the Philadelphia protests on May 30, which they noted were mostly peaceful.
In some of the photos, a woman with a peace sign tattoo who wore a T-shirt that read, "Keep the immigrants deport the racists," was seen. Her face was covered by what looked like a bandana in some photos. Others showed her face.
The FBI found the shirt on Etsy, which they called "unique," and found that a user by the name of "alleycatlore" left a five-star review of the shirt, according to the criminal complaint.
That username then belonged to a person who also used the username "lore-elisabeth," according to the FBI.
Authorities then searched Lore Elisabeth online and found a LinkedIn profile of a woman in Philadelphia. They learned she was employed as a massage therapist and her employer had videos posted to their website, with the woman in the video matching a driver's license photo of Blumenthal.
One of the videos showed the same tattoo the woman seen in the protests had, according to the criminal complaint.
A phone number listed by her employer came up belonging to Blumenthal and an address was also found, the criminal complaint stated. Etsy also later provided a record of sale after a subpoena was issued and the address was the same as the one they found through Blumenthal's employers.
