 The Hell Cannon and its variants were manufactured by elements of the Free Syrian Army in and around Aleppo in re-purposed manufacturing businesses that had the tools and materials available.As the Islamic State of Iraq and the Levant became more powerful in the region, it negotiated with local arms makers for making the projectiles and a grassroots weapons industry began to emerge.Some of the arms makers moved to al-Bab and Manbij after ISIL was expelled from Aleppo.