Reports this week warned that ISIS is testing dirty bombs containing colorless and odorless gas on captured Kurdish fighters.
The reports follow recently released photographs of Kurdish fighters with terrible blisters and burns on their skin that experts believe were caused by chemical bombs, the Daily Express reports.
As a result, Western intelligence officials have warned that suicide bombers may smuggle poisonous chemicals that could quickly kill thousands in a confined area into public venues.
Former FBI Intelligence Agent Timothy Gil told the Daily Express that ISIS laboratories are set up in Iraq, Syria and Libya to improve upon its dirty bombs to cause maximum casualties.
The dirty bombs are reported to be so sophisticated that that are undetectable, even when used, with Kurdish survivors of attacks with the weapons unaware that they had inhaled poison until hours later.
The Daily Express reported that ISIS is believed to have started experimenting with the weapons as a means of instilling fear but now see them as a means of causing mass casualties in the West.