According to the Twitter user @Raqqa_SL, the new missiles are being developed in a desert area north of Raqqa, the ISIS headquarters. The terrorists have tried linking five bomb detonators and explosives to captured anti-aircraft missiles to enhance their explosive power against aircraft.
The added explosives are linked to walkie-talkies that are used to detonate the additional explosives in an attempt to create a larger fragmentation blast that ISIS hopes will impact bombing aircraft.
U.S. and coalition aircraft have conducted numerous airstrikes against Raqqa. France stepped up its bombing of the city after the Paris terror attacks and Russia also is conducting large-scale and often indiscriminate bomb and missile strikes on the ISIS capital as well.