A group calling itself "Al Nusra and Jihad in greater Syria" claimed responsibility for the blast.[3] According to the UN report,[4] released October 20, the blast was the result of a truck bomb. Security video had captured a white truck driving near Hariri's convoy which investigators determined was carrying an estimated 1,000 kg of explosives. Since Hariri's convoy had jamming devices meant to block remote control signals, the attack was carried out using a suicide bomber.