Some alleged ISIS fighters in Syrian prison say they're American ISIS lost its last territory in Syria in March, but the group remains a terror threat. The reclusive leader of ISIS, Abu Bakr Al-Baghdadi, called for his followers to carry out attacks, and demanded the release of ISIS prisoners. President Trump has called on European countries to take their nationals who joined ISIS home from Syria – but in a Syrian prison holding alleged ISIS fighters, CBS News encountered prisoners who said they’re American. Holly Williams reports.