No damage or injuries were reported following yesterday's 8:00 pm (2100 GMT) blast but villagers at the bottom of the volcano on the Atlantic island nation were being evacuated over the weekend and a further eruption was reported today.
There were no immediate details on the intensity of the today's blast.
Vulcanologist Bruno Faria told state-owned Radio Cape Verde the first blast was "much greater than the one in 1995" which showered a cloud of ash across the island at the southern tip of the archipelago.
The eruption reached level three on the nine-level volcanic explosivity index, the minister said.
Morais said the nation was implementing its emergency civil protection plan.
Nelio Santos, a television journalist reached by telephone, told AFP authorities had begun evacuating Cha das Caldeiras, a village of around 750 inhabitants at the foot of the volcano.
"Many people... Left without waiting for the instructions from the authorities," he added.
The airport on Fogo was closed today, although it was not immediately clear how many flights had been diverted or cancelled.
Pico de Fogo last erupted on April 2 1995 -- for the first time since June 1951 -- and almost 5,000 people were evacuated while the United States and several European countries sent assistance.
The archipelago, which lies 500 kilometres (about 300 miles) off the coast of Senegal, consists of 10 islands, eight of which are inhabited and volcanic.
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