The opposition leader was detained for the duration of a money laundering trial.
19-year-old Shima has been missing since February 22.
Former president Yameen remains hospitalised.
The four men are suspected of stabbing an Indian national and stealing MVR2.3 million.
The attacks came after "constant death threats," Mickail Naseem said.
Some MVR2.5 million worth of equipment was allegedly diverted.
The 32-year-old man was arrested with hashish worth more than US$1 million.
Police raided a house in Malé on Saturday.
Six families have contacted the counter-terrorism centre.
The opposition leader attempted to bribe witnesses, prosecutors told the court.
The 46-year-old victim remains in critical condition.
ACC president Luthfy is under investigation over alleged money laundering.
The body was found with burns and torn skin on the southern Villigili island.
Several politicians and prominent businesses were named in the long-awaited report on the country's biggest corruption scandal.
Yameen is accused of using US$1 million from a company implicated in the country's biggest corruption scandal.
A protest march is due to take place on Friday.
The Human Rights Commission has concluded investigations of 45 cases involving unsolved murders and disappearances.