Brahim El Bakraoui and two other men ordered a taxi to take them from their hide out in the Schaerbeek district to Zaventem airport on Tuesday morning, before they committed one of the worst terrorist atrocities in Belgium's history.
Comment: The taxi driver, Kim Sengupta (of Moroccan descent), has apparently identified the other two men as Brahim's brother Khalid and Faycal Cheffou (the hatted man in the CCTV footage), who has been arrested and charged with "terrorist murders".
As soon as the driver heard about the attacks, he drove straight to a police station in central Brussels to tell the authorities every detail he could remember about the three men, including their hideout, a 5th floor apartment in Rue Max Roos.
Comment: After receiving the tip from Sengupta, police reportedly raided the apartment (No 4), where they found "an Isis flag, a bomb packed with nails and screws, detonators and enough chemicals to make 15kg of Triacetone Triperoxide (TATP), the explosive used in last November's Paris attacks."
But now the driver fears reprisals from Isis and their sympathisers for handing over such crucial information to the police.
Comment: Latest news: 5 new arrests in Brussels. Further reading: Miraculous passports and trashed laptops: What do 9/11 and the Belgian bombings have in common?