Former Mauritian Prime Minister Pravind Jugnauth and his wife, Kobita Raouf Gulbul, were arrested Sunday in a money laundering investigation.
Authorities seized 114 million Mauritian rupees ($2.4 million) in cash and luxury watches during searches at multiple locations.
The Financial Crimes Commission, leading the probe, found three suitcases and a bag filled with local and foreign currency.
Opposition leaders demanded transparency, with Reform Party leader Roshi Bhadain calling it a crucial test for the legal system.
Jugnauth, prime minister from 2017 to 2024, previously faced legal scrutiny in the 2011 MedPoint corruption scandal but was acquitted.
The government has yet to issue a statement as the nation watches the case unfold.