The U.S. Department of the Treasury's Office of Foreign Assets Control (OFAC) has updated its Specially Designated Nationals and Blocked Persons List (SDN List). They have added several companies and vessels to the list because they allegedly supported terrorism-related activities linked to ANSARALLAH. This action means that all assets and properties under U.S. jurisdiction belonging to these entities are frozen, and Americans are generally prohibited from conducting business with them. Additionally, updates have been made to some existing entries on the SDN List.
Simple Explanation
The U.S. Treasury department has put some companies and ships on a special list because they did something wrong related to a group called ANSARALLAH. This means people in the U.S. can't do business with them, and their U.S. properties are frozen.