The generals also announce that they are closing the country's borders and canceling the electoral process.
Parliamentary and presidential elections were held in the small West African nation on Sunday. Afterwards, both incumbent President Umaro Sissoco Embaló and challenger Fernando Dias declared victory, contributing to growing unrest in the country, which has suffered a number of coups in recent years.
The reports of gunfire in the capital Bissau came on Wednesday afternoon. There have also been unconfirmed reports that Embaló has been arrested.
