Belgian authorities have raised the security alert to the highest level following blasts at the Zaventem Airport and Maalbeek Metro station on Tuesday morning.
President Mahama in a tweet condemned the act and urged Ghanaians to "stand in solidarity with Belgium".
Background
A blast was reported at the Maalbeek metro station in Brussels, which is just meters away from the Gare de Bruxelles-Schuman railway station.
The Maalbeek metro station blast in Brussels has killed at least 10 people according to local police, as cited by TASS.
The explosion came less than an hour after a bombing at a Brussels airport killed at least 34 people.
Large amounts of smoke were seen coming out of the metro station in the Belgian capital. Brussels’ transport authority says all metro stations in the city are being closed, Reuters reports.