The Refugee Action Coalition says 21 refugees have left Nauru for the United States, only two days after an asylum seeker died on the island nation from a suspected suicide.
The RAC's Ian Rintoul says the departure on Sunday's of the 21 detainees is "bittersweet" as the Nauru community mourns the death of 26-year-old Farhad who was found dead in his family's tent on Friday.
"The Nauru community is still in shock because of Farhad's death," Mr Rintoul said.
"Everyone is wondering who is next. With so many nationalities being denied entry to the US, many people are left thinking that there is only one way off Nauru now."
Sunday's departure reportedly included individuals, as well as two families, from Myanmar, Sri Lanka, Pakistan and Afghanistan.
Mr Rintoul said no other flights from Nauru this year have included refugees from Iran, Somalia, Iraq, Sudan or Syria.
"The unofficial ban on nationalities under the Trump administration's travel ban continues," he said.
By Mr Rintoul's tally, 930 people, including 140 children, are still being held on Nauru.
The US has now accepted 186 refugees as part of a deal struck between former president Barack Obama and Prime Minister Malcolm Turnbull.
The minister responsible for immigration, Peter Dutton, has been contacted for comment.
