More than 140 people died in the Crocus City Hall assualt in Moscow on March 22, 2023.AFP via Getty Images Sara Harmouch, American University A deadly attack in Moscow on March 22, 2024, exposed the vulnerability of the Russian capital to the threat of the Islamic State group and its affiliate ISIS-K. But it also displayed the reach of the network, leading some terror experts to ponder: Could a U.S. city be next? There has not been a mass casualty assault in the U.S. carried out in the name of the Islamic State group since 2017, when a truck mowed down cyclists and pedestrians on a New York Ci…