The last tweet that the French satirical magazine Charlie Hebdo sent out before its offices were attacked Wednesday afternoon lampooned Islamic State (ISIS) leader Abu Bakr al-Baghdadi.
The tweet includes a drawing of al-Baghdadi speaking into a microphone, saying "Greetings from al-Baghdadi as well . . . and especially health."
Charlie Hebdo added a caption, which says "Best wishes, by the way."
The satirical magazine's Paris headquarters
were attacked by gunmen Wednesday afternoon, leaving at least 13 people dead, including two police officers.
The al-Baghdadi tweet was allegedly what prompted the attack.
The gunmen were seen on a video shouting "Allah!" as the shots were fired.
This is the second time that Charlie Hebdo has been attacked for satire on Muslims.
In 2011, the Paris headquarters were firebombed for including an image of the Prophet Muhammad on the cover of its magazine, which it also called its Shariah edition.