Islamic State has gone underground in its Syrian stronghold since President Barack Obama authorised U.S. air strikes on the group in Syria, disappearing from the streets, redeploying weapons and fighters, and cutting down its media exposure. In the city of Raqqa, 450 km (280 miles) northeast of Damascus, residents say Islamic State has been moving equipment every day since Obama signalled on Sept. 11 that air attacks on its forces could be expanded from Iraq to Syria.