Belgium is facing criticism for errors in its investigations before, during and after the attacks in Brussels. These include tips from the US and Turkey, and missed signals on a bomber's parole violations.
Brussels bomber Ibrahim El Bakraoui had a criminal record, convicted in 2010 for an armed robbery in which he shot a Belgian police officer when trying to escape. A day after the attacks, Turkish President Recep Tayyip Erdogan said that he could have been behind bars last Tuesday.
Turkey deported El Bakraoui on July 14, 2015, having captured him on the border with Syria. Ankara informed both Belgian and Dutch authorities after El Bakraoui requested that he be sent to Amsterdam - later returning home to Brussels by land. The formal deportation note has since been leaked by the Dutch, although any substantive intelligence information would have been communicated separately.