Belgian officials say the attackers changed shifted their target as investigators closed in on them. The information emerged after authorities arrested and interrogated key suspects.
In the wake of the deadly attacks in Belgium's capital in March, two brothers were quickly identified as suspected suicide bombers; authorities took longer to name their suspected accomplices.
Belgium's prosecutors say Mohamed Abrini, who was arrested Friday in connection with November's Paris attacks, has admitted that he is the "man in the hat" seen in a video with two Brussels bombers.
On Sunday, 12 days after the deadly attacks on Brussels, the airport is partially reopening. Meanwhile, authorities are cracking down on protests and named another suspect in a foiled plot on Paris.
The three were detained in raids on Sunday. Belgian police are still trying to identify a third suspect from the airport bombing and have released a 32-second video of CCTV footage over YouTube.
A third man has been charged in connection with an alleged plot to launch a new attack in Paris. Meanwhile, a "march against fear" planned in Brussels on Sunday has been called off.
Turkey faces criticism for border policies allowing jihadists to flow back and forth from Syria. But it deported one of the Brussels bombers in 2015, and says Europe failed to take warnings seriously.