Reports from Fiji say the Fiji Law Society has written to the military commander and the attorney-general following the detention of two lawyers by the military over the weekend.
A lawyer, Ratu Savenaca Komaisavai, has been in custody for more than two days while another lawyer, Kitione Vuataki, has been freed.
Mr Vuataki was taken from his office after the military claimed that he had made comments that amounted to incitement.
After his release, Mr Vuataki blamed the media and sais he would be more careful aboout waht he says.
Fiji is ruled under emergency provisions declared by the military in December when it removed the government at gunpoint and closed parliament indefinitely.
According to the Fijilive website, the Law Society has raised the lawyers' detention in the letter.