In response to U.S. airstrikes on Islamic State (IS) and al-Nusra Front-affiliated targets, jihadists flooded social media—particularly Twitter—to condemn the attacks, call for jihadist unity in the region, and issue threats toward the U.S. and allied countries.

After releasing the trailer for the video, the Islamic State (IS) issued the documentary-style production, "Flames of War: Fighting Has Just Begun," promoting its cause and highlighting some of its major operations in Syria. The 55 minute, 13 second video was produced by the group's al-Hayat Media Center, and was distributed on Twitter on September 19, 2014.

The Islamic State (IS) released the first episode in which a British captive, John Cantlie, speaks on the alleged truth about the group that is hidden by the Western media. The 3 minute, 21 second video, entitled, "Lend Me Your Ears: Messages from the British Detainee John Cantlie," was produced by the group's al-Furqan Media Foundation, and distributed on Twitter on September 18, 2014.

An American citizen, Ali Muhammad Brown, is accused of executing four men—Leroy Henderson, Dwone Anderson-Young, Ahmed Said, and Brian Tevlin—in a shooting rampage across multiple states, intended as revenge against American policy in the Middle East. In response to investigators' questions, he stated: "All these lives are taken every single day by America, by this government. So a life for a life."

The Islamic State (IS) released a video of beheading its British captive David Cawthorne Haines and threatening to execute another Briton, Alan Henning.