Arab sources said Thursday that groups of assassins are operating secretly in Damascus to kill senior figures of the Assad regime and sow fear and panic among others. The groups consist of several cells that operate independently at night. Some of the cells called "oppressor deterrence battalions" are made up of rebels from Assad's army. The underground announced its existence on April 14 in two videos released on social media that reportedly show the dead bodies of two regime figures killed by the assassins. Another group, belonging to the Liwa al-Adiyat rebel organization, was responsible for the killing of the bodyguard of Asma al-Assad, the president's wife.