The attackers who struck Brussels on March 22 initially planned to launch a second assault on France, Belgium's Federal Prosecution Office said Sunday.
The arrest Friday of five men suspected of links to the Brussels bombings, including the last known fugitive in last year's Paris attacks, raised new questions about the extent of the Islamic State cell believed to have carried out the intertwined attacks that left 162 people dead in two countries.
Two more Americans have been identified as killed in the attacks on Brussels, the State Department confirmed Sunday, bringing to four the total number of U.S. citizens confirmed as victims.
Belgian prosecutors announced they have charged three men with terror offenses over the suicide attacks on the Brussels airport and subway, as organizers canceled a solidarity rally at the government's request because police are too strapped to cope.
President Barack Obama is offering his prayers for the families of the two Americans killed in the bombings in Brussels and telling Belgians that "America has their back" in the fight against terrorism.
Brussels airport officials say flights won't resume before Tuesday as they assess the damage caused by twin explosions in the terminal earlier this week.
Police raided Brussels neighborhoods again Friday in an operation a local official said was linked to both the airport and subway bombings and to the arrest in the Paris suburbs of a man who may have been plotting a new attack in France.
U.S. Secretary of State John Kerry has arrived in Brussels for counter-terrorism talks with EU and Belgian officials and to pay his respects to the victims of this week's attacks.