Missing bomber's exit from airport was PLANNED say officials

two accomplices massacred 14 people in a double suicide bombing, officials believe.

Three ISIS attackers said by the terror group to be wearing suicide vests were seen on CCTV wheeling suitcase bombs into the busy check-in area just after 8am local time (7am GMT) after arriving in a taxi.

Two of the men, who were pictured wearing black gloves believed to contain detonators on their left hands, exploded their nail-shrouded devices in the first of twin terror attacks on the Belgian capital that left at least 34 people dead.

U.S. officials who studied the CCTV said the third bomber had already abandoned his bomb and his departure from the airport 'appeared to be planned'.

Less than 80 minutes later, a further blast on a Metro train at Maelbeek station - near to the EU Parliament building - left another 20 people dead. 

It was unclear whether the missing airport suspect was responsible and Belgian police were last night 'actively searching for' Europe's most-wanted man, who had been wearing a white coat, glasses and a hat.

Other reports suggested the 'man in white' fled the airport after his devices failed to detonate. The Belgian army was said to have found and neutralised his abandoned suitcase and a suicide vest left at the scene.

Belgian police launched a major manhunt to find him as ISIS claimed responsibility for the massacres, which killed 34 in total and injured 200. 

Local mayor Francis Vermeiren confirmed the ISIS suspects checked in their explosives-packed suitcases just seconds before the atrocities.

He said: 'They came in a taxi with their suitcases, their bombs were in their bags.

'They put their suitcases on trolleys, the first two bombs exploded. The third also put his on a trolley but he must have panicked, it didn't explode.'

Belgian newspaper HLN said a taxi driver told police he believes he unwittingly drove the bombers to the airport and was abruptly ordered not to touch their suitcases when he offered to help them with their luggage.

The two men whose suitcases successfully detonated – blowing themselves up in the process - were wearing gloves on their left hands, which security sources say would have hidden the triggers for their explosives.

It is a similar technique said to have been used by the jihadists who carried out the sickening Paris massacres last November. Witnesses to the attacks on the French capital, which killed 130 people, told in the aftermath how they saw the attackers holding a detonation mechanism in their hand with a cord travelling to a suicide vest.

The third Brussels suspect fled the terminal before the carnage ensued and U.S officials believe his calm departure indicates he may have planned all along to leave before the bombs exploded.

Belgian police have issued a 'wanted' poster showing him wearing a light-coloured coat and black hat while wheeling his suitcase on a luggage trolley.

'Police are looking to identify this man. He is suspected of having committed the attack at Zaventem on Tuesday March 22,' a police spokesman said.

A string of anti-terror raids were carried out across the Belgian capital last night, with police confirming another nail bomb, an ISIS flag and several 'chemical products' were found at a house in the Schaerbeek area which was searched in connection with the terror attacks.

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Police swooped on a number of suspects but the Belgian Foreign Ministry said many of those behind the chilling terror plot are 'still at large'.

It emerged as the world comes to terms with yet another deadly terror attack in Europe - just four months after 130 people were massacred in Paris.

In all too familiar scenes, terrifying photos showed bloodied victims and maimed bodies after two bombs were detonated at Brussels' main airport.