New video footage of the 'man in the hat' suspect in the terrorist bombing at Brussels airport has been released.

CCTV images have been made public, which show the man on the morning of the bombing, as they appealed for help tracking him down.

The man is believed to have attempted to blow himself up alongside two fellow suicide bombers but fled after his suitcase explosive failed to detonate.

A second bombing in the Maelbeek underground station an hour later killed another 16 people in a coordinated series of attacks later claimed by Islamic State terrorists.

The newly-released images show the fugitive suspect leaving the airport on foot. According to a reconstructed route, he then walked into Brussels, after which point investigators have been unable to track his movements further.

Prosecutors have appealed for anyone who might have video or photo images to come forward. They added that the suspect wore a white jacket but discarded it at some point.