US Dept of State Alert on Provisionally Revoked/Expired/Cancelled Visas
DOS alert that visas that were provisional revoked are now valid for travel to the U.S., if the holder is otherwise eligible. Individuals whose visas are expired, or were physically cancelled, must apply for a new visa, absent a CBP grant parole or waive the visa requirement at the port of entry.
The U.S. Immigration Law Blog by Ashwin Sharma 