npr:

One day after President Trump signed an executive order halting the admittance of all refugees to the United States, and temporarily freezing immigration from seven mostly Muslim countries, the effects of that freeze are already beginning to be seen at airports both in the U.S. and abroad.

Confusion and chaos are roiling international airports, where refugees from those countries are being barred from boarding U.S.-bound flights.

Several Iraqi refugees in Cairo, who had been cleared for resettlement in the U.S., have been blocked from boarding their flight to New York City. And in Iraq, NPR’s Jane Arraf reports that “members of Yazidi minority, one of the biggest victims of ISIS, were prevented from boarding despite having visas.”

Green card holders — legal permanent residents of the U.S. — are also included in the ban, according to a senior Trump administration official. The official says they will need a case-by-case waiver in order to return to the U.S. if they are currently outside the country.

At major U.S. airports, NPR’s Kirk Siegler reports international refugee assistance groups are sending attorneys and translators to support new arrivals who are being detained.

Colleges and universities around the U.S. have been advising students from the seven listed countries — including lawful permanent residents — not to leave the U.S. until there is further clarity on the new rules. Students at Princeton, Stanford and Chapman University, among others, reported letters from their respective schools recommending caution.

Protesters have been rallying outside Kennedy International Airport to protest Trump’s executive order on Saturday. New York City officials and immigrant advocates are holding are also holding a vigil at the airport Saturday evening.

Arrivals To U.S. Blocked And Detained As Trump’s Immigration Freeze Sets In

Photos: Olivier Douliery-Pool/Getty Images; Stephanie Keith/Getty Images