Shortly before 10:00pm ET on Thursday, Twitter users began complaining of unusual photos appearing in their timelines.
Source: Twitter
"Almost all pics are getting replaced by some weird Benghazi Libya/US flag bloody hand image," tweeted user @Eledhril.
A quick search for related tweets pulled up more than 20 complaints about the same mysterious image. Users described it as a "bloody hand" and "disturbing picture of American flag" with a message "about Libya on September 11th."