The ISIS chemical weapons drone scenario is only theoretical at this stage but this new nightmare for European security services is based on real data and specific investigations.
The possibility was raised by French intelligence services after they finished analysing the computer of terror chief Salah Abdeslam, who commanded the ISIS unit responsible for the massacres in Paris on 13 November 2015.
Officers in the French capital found information suggesting terrorists were planning several other attacks, including at least one featuring the use of chemical weapons on remote-controlled aircraft.
Chemical weapons are seen as a viable option for jihadists and the first attempts to use them or put them in mortar bombs or rocket launchers dates back to the Taliban regime in Afghanistan.
But unlike other terrorist organisations, ISIS has been able to move forward using chemical weapons which found their way to its Syrian strongholds after the looting of Libyan dictator Muanmar Gaddafi’s weapons arsenals.
Intelligence chiefs believe ISIS weapons manufacturers have studied those samples and some Iraqi samples left over from the time of Saddam Hussein.
They fear Dash could be capable of producing significant quantities of mustard gas and chlorine and also developing the technology to deploy such chemical weapons in mortar shells.
According to the analysis of many Western intelligence services, the final goal of ISIS leaders is to include those weapons in drones already widely used in the Iraqi and Syrian front.
After being initially used to film the operations of car bombs, Isis has begun to use the unmanned aircrafts to drop 40mm grenades right on the enemy.
The remains of that aircraft were examined very carefully by the technicians of the Western security services engaged to assess the threat of a chemical bomb from a drone causing a massacre in the heart of a European city.
The experts refused to rule at the possibility of such an attack in the future.
One security officer said: “Drones are handcrafted using polystyrene and very cheap Chinese components while chlorine and mustard gas can easily be smuggled to Europe through Turkey.”