The U.S. government imposed new restrictions on Americans going to Cuba, banning the most common way Americans travel to the island. The ban was announced Tuesday as a part of a new series of travel-related sanctions.

Beginning on Wednesday, тhe Trump administration will not allow group educational and cultural trips to the island unless they were booked before June 5, the Treasury Department said in an official statement. Nor will it permit cruises, private yachts or fishing vessels to stop in Cuba. Group people-to-people trips have become the most popular form of U.S. leisure travel to the island, bringing more than 142,000 people in the first four months of the year that is more than a 300% increase over the same period last year.