“Ansar al Sharia, an al Qaeda-linked group, claims to have shot down a Libyan jet earlier today. The claim of responsibility (seen above) was posted on Twitter feeds maintained by Ansar al Sharia’s propaganda arm (Al Rayah Media) and radio station. The organization says a special air defense brigade was responsible for the jet’s crash, but no other details were provided. Jihadists also tweeted images of the plane’s wreckage (see below).”
Source: Ansar al Sharia claims to have downed jet flying over Derna, Libya | The Long War Journal