A Belgian security official says the death toll has risen to 34 in attacks on the Brussels airport and a subway station.
The official did not specify how many people were killed and wounded at each site. The official spoke on condition of anonymity because precise numbers were expected to be announced early Wednesday.
Earlier, the government had reported 20 dead at the Maelbeek metro station, in the heart of the European Union's capital, and 11 dead at the airport, and scores of injured.
The Islamic State group claimed responsibility for the attacks.