Why did the military officers seize control of one of the poorest countries in the world?

Why did the military officers seize control of one of the poorest countries in the world?

A group of army officers in Guinea-Bissau have announced that they have seized power and arrested President Umaro Sissoco Embalo. A spokesman for the junta said that the military had closed the borders, imposed a curfew and suspended all institutions in the Republic of Guinea-Bissau. This comes a day before the country was due to announce the results of a closely contested presidential election.

Credit to : DW News