Belgian police on Monday released new video footage of the third suspect whose bomb failed to go off at Brussels airport in last week's attack.

The footage shows the man wearing a hat and white jacket pushing a trolley with a large bag through the departure hall, next to suicide bombers Ibrahim El Bakraoui and Najim Laachraoui.

"It's a new video which had not previously been released," a spokesman for the federal prosecutor's office told AFP.