A surprise Supreme Court ruling last week ordering the release of imprisoned opposition leaders has led to growing turmoil, with the president lashing out at the court, opposition protests spilling into the streets of the capital, Male, and soldiers in riot gear deployed to the parliament building to stop lawmakers from meeting.
The extent of the emergency order was not immediately clear.
"During this time though certain rights will be restricted, general movements, services and businesses will not be affected," President Yameen Abdul Gayoom said in a statement issued after the state of emergency was announced on state television.
Yameen, in a letter to the court released by his office earlier today, said the order had encroached on the powers of the state and was an "infringement of national security and public interest." He urged the court to "review the concerns" of the government.
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Officials say the court has not properly responded to a series of letters citing problems with implementing the order, including that the cases against the political prisoners are at different legal stages.
A Supreme Court statement on Sunday said "there are no obstacles in implementing the ruling ... and that this has been informed to the Prosecutor General's office."
Clashes have erupted between police and the opposition supporters. Soldiers have occupied the parliament building to stop lawmakers from entering.
The United Nations and several foreign governments, including the United States, have urged the Maldives to respect the court order.
Nasheed has been living in exile in Britain since 2016 after being given asylum when he traveled there on medical leave from prison.
In addition to ordering the release of the political prisoners, the court also reinstated 12 lawmakers who had been ousted for switching allegiance to the opposition.
Known for its luxury tourist resorts, the Maldives became a multiparty democracy 10 years ago after decades of autocratic rule by the current president's half brother, Maumoon Abdul Gayoom.
But the nation lost much of its democratic gains after Yameen, who has maintained a tight grip on power, was elected in 2013. He had been set to run for re-election this year virtually unopposed, with all of his opponents either jailed or exiled.