A resident of Tabqa city touring the streets on a motorcycle waves an Islamist flag in celebration after ISIS militants took over Tabqa air base, in nearby Raqqa, Syria. [Representational Image]Reuters

Islamic State militants, who have built a cache of dangerous improvised weapons, including scorpion bombs, reportedly bombed civilians in an Iraqi district with chlorine gas.

Security officials said that the militants filled mortar shells with chlorine gas before launching them at a Baghdadi district in Anbar province.

"The ISIL terrorists bombarded Baghdadi district of western Anbar province with mortar shells loaded with chlorine gas," a security official told Iraqi News on Wednesday. Casualties from the attack are not known.

The militants also reportedly used chemical gas against Iraqi soldiers in Saqlawiya district of the northern town of Fallujah, according to Press TV, which also reported that ISIS had killed 300 soldiers in September in a chlorine gas attack.

The Islamic State had earlier claimed to have 'dirty bombs', which comprise explosives, such as dynamite, with radioactive material such as uranium, and had threatened terror attacks in London.

Last week, reports of ISIS using 'scorpion bombs' emerged, in which they used bombs containing live scorpions to wreak fear among locals as the poisonous creatures crawled out.

A British military expert, Hamish de Bretton-Gordon, had highlighted that the militants were using the two-feet bombs with the deadly creatures for "psychological impact" and to create fear.

He had also warned that the ISIS had access to stockpiles of mustard gas and sarin gas that are used as chemical weapons.

Apart from weapons, ISIS militants are also reportedly resorting to inhuman tactics to wipe out local resistance.

Security officials said ISIS had cut off water supply to the Baghdadi district and also reportedly prevented water department employees from restoring the supply.

The families in the district are believed to be in dire need of food and water. 

Four children have already died due to shortage of food, Iraqi News reported.