ISIS militants have taken control of towns in Iraq and Syria . The group has been fighting for years to establish an Islamic state across the region that would be governed by Sharia law. Citizens from France , Germany , Denmark , U.S. have carried out bombings in Iraq and Syria . And if they come home , will they bring terrorism with them ? Security experts are concerned that Western militants may return home to cause chaos .
ISIS militants have taken control of towns in Iraq and Syria . The group has been fighting for years to establish an Islamic state across the region that would be governed by Sharia law. Citizens from France , Germany , Denmark , U.S. have carried out bombings in Iraq and Syria . Security experts are concerned that Western militants may return home to cause chaos .