Explosions at Brussels Airport and metro station

The Belgian prosecutor's office has confirmed that the three men in this CCTV footage are suspects in the investigation of the Brussels attacks.

And this picture reveals an important detail that might have given them away.

The two men dressed in black are believed to have carried out the suicide bombings. They are wearing only one glove on their left hand.

According to the Belgian news site La Libre, the single glove could have helped them hide a detonator. A security expert also told Sky News that the matching gloves could be a clue about which device was used.