Trinidad, Bolivia ? A judge denied bail Monday for three suspects accused of plotting to bomb New York’s John F. Kennedy International Airport, ordering them to remain in jail until a hearing on a U.S. request for their extradition.

The three men – Kareem Ibrahim, Abdul Kadir and Abdel Nur – smiled and waved to about 20 supporters and family members in the courtroom in Port of Spain but did not speak.

Chief Magistrate Sherman McNicols said he was denying bail “given the nature and the seriousness of the offense,” and ordered them to remain in jail until an Aug. 2 hearing on a U.S. extradition request.

The suspects, arrested this month in the twin-island Caribbean nation, are accused of participating in a Muslim terror cell that planned to blow up a jet fuel artery that runs through residential neighborhoods and feeds Kennedy airport.

The alleged mastermind of the plot, U.S. citizen Russell Defreitas, 63, is a Guyana native who worked as a cargo handler at the airport until 1995. He is in custody in New York.