Fiji's interim attorney general says the president of the Fiji Law Society Dorsami Naidu could be held by police for 24 hours under emergency regulations.
Aiyaz Sayed-Khayum has confirmed that Mr Naidu is being detained by police in Lautoka.
His detention comes after the Fiji Law Society wrote to members of the judiciary advising them to abide by the oath that they took, following the sacking of judges by President Ratu Josefa Iloilo.
The dismissal came after the judiciary ruled last week that the government led by Commodore Frank Bainimarama was illegal.
The Interim Attorney General says the police are acting under the regulations and he does not know why Mr Naidu has been detained
"I can only say that they would be acting under the public emergency regulations and one of the reasons they can be detained is if that person is breaching the peace or there is the potential to breach the peace."
Aiyaz Sayed-Khayum says he does not know of any judges or magistrates who have been questioned by police.
Meanwhile, Human rights activists and lawyers reportedly came together in front of Fiji's court houses today to show their support for the sacked judges.
Reliable sources say about six lawyers and ten human rights activist stood in front of the court house in Suva in a protest against the sackings while around twenty other lawyers protested in other parts of the country.
According to the sources, several judges showed up to work on Tuesday, but were locked out of their offices.