The Group to Support Islam and Muslims bragged about killing Westerners and attacking "a site of debauchery"
The aircraft crashed over a residential area as it returned from bombing raids over Derna.
The violence of ISIS and Al-Qaeda affiliates threatens to spread far beyond Nigeria and Somalia.
Police killed one suspected militant in the capital Ouagadougou and are hunting two more.
Militants have killed 68 U.N. peacekeepers in Mali in the past three years, but the blue helmets aren't giving up yet.
Al-Qaeda's North Africa branch said it did battle with "crusader occupation forces" in northern Mali.
At least 30 people were killed when gunmen attacked a hotel and cafe in Ouagadougou on Friday.
At least 28 people were killed when Al-Qaeda-linked militants attacked a hotel in Burkina Faso's capital on Friday.
At least 20 people died and others were taken hostage when Islamist gunmen stormed the Splendid Hotel.