John T. Earnest , the perpetrator of the Poway synagogue shooting at the Chabad of Poway in Poway , California on April 27 , 2019 and the California mosque fire at the Islamic Center of Escondido in Escondido , California on March 25 , 2019 had posted links to his open letter and his attempted livestream on 8chan which Earnest also named as a place of radicalization for him . According to 8chan 's Twitter , the shooter 's post was removed nine minutes after its creation
Poway synagogue shooting
Poway synagogue shooting
8chan