In the Islamic State group's Syrian stronghold of Raqqa, sirens ring out whenever a warplane approaches as jihadists flee their posts and vehicles to hide, activists say.
A US-led coalition and Russia have stepped up air strikes on the jihadists' de facto Syrian capital since IS claimed to have downed a Russian passenger plane over Egypt's Sinai in October and the deadly jihadist attacks in Paris two weeks later.
A fellow activist who calls himself Abu Sham al-Raqqa added: "Whenever the jets fly over they set off the sirens to warn the fighters and the residents, and the problem is that the bombing is going on night and day."
According to Hashimi, IS has stopped transporting its oil products in 36,000-liter tankers and started using smaller, 4,000-liter vehicles after coalition and Russian airstrikes targeted hundreds of fuel trucks in Raqqa and Deir Ezzor, where it controls most oil fields.