He “shouted twice 'Allahu Akbar'" ('God is greatest', in Arabic) before attacking the soldiers, according to the Belgian federal prosecutor
European and Iraqi intelligence officials and a French lawmaker who follows the jihadi networks described camps in Syria, Iraq and possibly the former Soviet bloc where attackers are trained to attack the West.
Belgian prosecutor Federal Prosecutor Frederic Van Leeuw identified two of the Brussels attackers as brothers: Ibrahim El Bakraoui, a suicide bomber at the airport, and Khalid El Bakraoui, who targeted the subway.
Cruz said the U.S. should stop the flow of refugees.
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 president of Mexico regretted the tragic events and expressed his solidarity with the people of Belgium.
Eloy Cantú, Ambassador of Mexico to Belgium, said that they could have been at the airport.
There was no credible claim of responsibility eight hours after the first blast; but the coordinated assault, four days after Brussels police captured the prime surviving suspect in the Islamic State attacks on Paris, turned immediate attention to local Islamists.
Young men have been recruited by a mix of back street preachers, social media and a growing network of hometown jihadists spreading tales of derring-do in Syria.
Brussels is virtually paralyzed due to terrorist threats.