The fugitive suspect in the Brussels Airport attack is Najim Laachraoui, who has also been identified as an IS bombmaker.

The 25-year-old has been named in Belgian media reports as the third man captured on CCTV at the airport, alongside two other bombers - brothers Khalid and Ibrahim El Bakraoui, both of whom killed themselves in the attacks.

At least 14 other people were also killed when the twin blasts ripped through the airport's departure hall but Laachraoui is reported to have fled the scene after his bomb failed to detonate.

Following the attacks, a taxi driver told police he had picked up three suspicious customers earlier that morning - and took investigators to a house in the Brussels suburb of Schaerbeek, where he had collected them, according to Belgium's HLN newspaper.

It was in that house that police found a nail bomb, chemical products and an Islamic State flag - but no sign of Laachraoui, the fugitive in a hat who is now Belgium's most wanted man.

Laachraoui, previously known by the false name of Soufiane Kayal, is also suspected of making the bombs used in November's Paris massacres, after his DNA was found on suicide belts used in the Bataclan Theatre and the Stade de France.

Prosecutors had said on Monday - the day before the Brussels attacks - that he had travelled to Hungary in September with Salah Abdeslam, the prime suspect in the Paris attacks, who was captured by police last week.

Laachraoui is also believed to have travelled to Syria in February 2013.

(Sky News)