Activists demonstrate as travelers arrive on the first day of the the partial reinstatement of the Trump travel ban at Los Angeles International Airport (LAX) on June 29, 2017 in Los Angeles, California.

U.S. President Donald Trump's administration reversed a decision late on Thursday as its revised travel ban took effect and said fiancés would be considered close family members and therefore allowed to travel to the United States.

The U.S. State Department concluded "upon further review, fiancés will now be included as close family members," said a State Department official who requested anonymity.

The Trump administration had previously decided on the basis of its interpretation of a U.S. Supreme Court ruling that grandparents, grandchildren and fiancés traveling from Iran, Libya, Somalia, Sudan, Syria and Yemen would be barred from obtaining visas while the ban was in place.

The 90-day ban took effect at 8 p.m. EDT (0000 GMT Friday) along with a 120-day ban on all refugees.

On Monday, the Supreme Court revived parts of Trump's travel ban on people from six Muslim-majority countries, narrowing the scope of lower court rulings that had blocked parts of a March 6 executive order and allowing his temporary ban to go into effect for people with no strong ties to the United States.

A spokesman for the Department of Homeland Security, who requested anonymity, said it would be updating its guidance to state that fiancés will not be barred from obtaining visas while the ban is in place.

The Supreme Court exempted from the ban travelers and refugees with a "bona fide relationship" with a person or entity in the United States. As an example, the court said those with a "close familial relationship" with someone in the United States would be covered.