It was not immediately clear whether another survivor, a Bahamian citizen, remained in detention.
Six other Jamaican and Bahamian survivors each face a federal charge of attempting to re-enter the U.S. after being deported. One also faces an attempted smuggling charge.
Five defendants are scheduled to be arraigned Oct. 31 in Miami federal court, and the sixth defendant's arraignment is scheduled for Nov. 4.
The Miami-Dade Medical Examiner's Office previously identified one of the victims as Carmen Valeris, a Haitian woman.
One of the other victim's relatives has identified her as Woodline Alexis, also a Haitian woman, but the last two victims remain unidentified, Larry Cameron, director of operations at the medical examiner's office, said Wednesday.
Thousands of migrants from Haiti, Cuba and other Caribbean countries attempt to illegally enter the U.S. each year by attempting risky sea voyages in overloaded or unseaworthy vessels, often through established smuggling networks that include islands in the Bahamas and Turks and Caicos.
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