Following Sunday's attack in Orlando, "the hacker decided to replace ISIS imagery posted to the accounts with rainbow flags and pro-LGBT messages," Newsweek reported. "A hacker affiliated with the hacktivist collective Anonymous, who uses the online moniker WauchulaGhost, first began hijacking pro-ISIS Twitter accounts several months ago," Newsweek noted. The gunman in Orlando, Omar Mateen, who killed 49 people in his rampage, swore allegiance to ISIS in a call to police in the course of the incident.