The government said the protests would damage the country’s troubled economy and create “devastating consequences for the most vulnerably people in our population”.
Prime Minister Evans Paul made an appeal for calm.
The government “cannot lower the price of petrol. It’s not that we do not want to, it’s because we are not able to,” he said.
Protesters say they will set up new roadblocks in Port-au-Prince on Tuesday.
Mr Martelly began ruling by decree last month after the parliament’s term expired. via BBC News