Brussels attack: Two brothers identified as suicide bombers, manhunt on for key suspect

With massive investigations underway following the deadly twin explosions in Brussels which killed 31 people and wounded 270 others, officials have unearthed that two of the bombers were brothers and one of the bombers at the airport appears to be a man authorities named as a suspect in the Paris terror attacks.

According to CNN, investigations are far from finished and have only just begun as now attempts will be made to unearth the terror nexus in the attack.

Belgian federal prosecutor Frederic Van Leeuw identified Ibrahim El Bakraoui as one of two suicide bombers at the Brussels airport and his brother, Khalid El Bakraoui, as the man behind a deadly suicide blast about an hour later on a train near the Maelbeek metro station.

This isn't the first time they've come across authorities' radar as earlier, Ibrahim was deported by Turkey to the Netherlands last year.

Belgian authorities responded in July 2015 saying he had a criminal record but no known ties to terrorism.

Investigators believe both were killed in the airport blast. But authorities are looking for the third man in the photo that has been circulating showing all suspects walking together with luggage trolleys.

Belgium's interior minister said that man placed a bomb at the airport and left.

Two people were arrested in Brussels one in Schaerbeek and the other in Haren, Van Leeuw and one was released later that day.

The raid came following a tip-off from a taxi driver who recognized the men shown in surveillance footage and told authorities he'd driven the men to the airport before the attacks.

Investigators found chemical products and an ISIS flag during a house search in Schaerbeek.