In a CCTV footage grab, the three suspects of the attack are seen at the Zaventem airport.
Surveillance camera images of the three suspects in the attack were published by the Belgium authorities, reported Belga news agency.
Deconstructing the grainy picture, released by Belgian police at the request of the federal prosecutor, shows three men pushing trollies with suitcases past the check-in area. Two have dark hair and one is wearing a hat.
Authorities have also found an explosive device while conducting the raids in Schaarbeek, a northern suburb of Brussels, the Belgian prosecutor's office has confirmed.
"The searches have led to the discovery of an explosive device containing nails, among other things. The investigators have also discovered chemical products and an Islamic State (IS) flag," The Guardian reported.
Earlier a third bomb was found at the airport and was destroyed by security services.
The Amaq agency, that scoops news directly from ISIS, said that suicide bombers had strapped explosive belts to carry out the attack.
Amaq carried the claim of responsibility and said: “Islamic State fighters opened fire inside Zaventem Airport, before several of them detonated their explosive belts, as a martyrdom bomber detonated his explosive belt in the Maalbeek metro station.”
Public broadcaster VRT said police had found a Kalashnikov assault rifle next to the body of an attacker at the airport.
Such weapons have become a trademark of IS-inspired attacks in Europe, notably in Belgium and France, including on November 13 in Paris.
An unused explosive belt was also found in the area, the public broadcaster said. Police were continuing to scour the airport for any further bombs or attackers.
At least 34 people were killed and some 200 injured in coordinated bomb attacks on Brussels' main airport and the subway. One of the two airport blasts is believed to have been a suicide bombing.