Belgian authorities have reported that the status of two of the five terrorists responsible for Tuesday’s attacks remains unknown.
Two terrorists bombed the metro station on Tuesday, which claimed at least 20 victims. Khalid el-Bakraoui died in the suicide attack, but authorities believe a second man was involved in the blast.
Surveillance footage shows a man holding a large bag at the station, but it is unclear as to whether or not he was among the 20 killed in that explosion or if he remains at large.
Najim Laachraoui and Ibrahim el-Bakraoui, who were behind the Brussels airport attack that killed 11 people, have been confirmed dead. However, a third unidentified suspect is believed to be at large. His image was captured using video surveillance, but the picture is too grainy to ascertain his identity.
Authorities have reported that the el-Bakraoui brothers helped plan the Paris attacks that killed 130 people last November. One of the brothers reportedly rented an apartment belonging to Salah Abdeslam, who was arrested on March 18 in Brussels for his involvement in the Paris attacks.
Najim Laachraoui, the suspected bomb-maker and an alleged Islamic State recruiter, was also linked to the Paris attacks. His DNA was found on explosives belts in Paris and at a Brussels apartment used as a safe house for the late Salah Abdeslam.
A senior Belgian counterterrorism official suspects that Abdeslam would have taken part in the Brussels attacks had he not been arrested just days before.