The din of banging pots and honking car horns reverberated through Myanmar’s biggest city of Yangon late on Tuesday in the first widespread protest against the military coup that overthrew elected leader Aung San Suu Kyi.

The party of the detained Nobel Peace laureate called for her release by the junta that seized power on Monday and is keeping her at an undisclosed location. It also demanded recognition of her victory in a November election.

A senior official from her National League for Democracy (NLD) said he had learned she was in good health a day after her arrest in a military takeover that derailed Myanmar’s tentative progress towards full democracy.

The U.N. Security Council was due to meet later on Tuesday amid calls for a strong global response to the military’s latest seizure of power in a country blighted for decades by army rule.

U.S. State Department officials said the takeover had been determined to constitute a coup d’etat, triggering restrictions in foreign assistance. Washington has threatened to reimpose sanctions on the generals who seized power.

In the biggest public display of anger so far, people in Yangon banged on pots and pans and honked car horns and chanted “evil be gone”.

“It is a Myanmar tradition to drive away evil or bad karma by beating tin or metal buckets,” said Yangon resident San Tint.

People have not taken to the streets so far in a country with a history of bloody repression of protests.

The coup followed a landslide win for Suu Kyi’s NLD in an election on Nov. 8, a result the military has refused to accept, citing unsubstantiated allegations of fraud.

The army handed power to its commander, General Min Aung Hlaing, and imposed a state of emergency for a year.