Mexico’s “Noticieros Televisa” reports that the Jalisco New Generation Cartel (Cártel Jalisco Nueva Generación, or CJNG) has been using drones laden with the plastic explosive called C-4 to attack rival cartels.
From the Wikipedia entry on C-4 https://en.wikipedia.org/wiki/C-4_(explosive) :
“Terrorist groups have used C-4 worldwide in acts of terrorism and insurgency, as well as domestic terrorism and state terrorism.”
“Composition C-4 is recommended in al-Qaeda’s traditional curriculum of explosives training. In October 2000, the group used C-4 to attack the USS Cole, killing 17 sailors. In 1996, Saudi Hezbollah terrorists used C-4 to blow up the Khobar Towers, a U.S. military housing complex in Saudi Arabia. Composition C-4 has also been used in improvised explosive devices by Iraqi insurgents.”