© Het Nieuwsblad / ReutersDamage is seen inside the departure terminal following the March 22, 2016 bombing at Zaventem Airport, in these undated photos made available to Reuters by the Belgian newspaper Het Nieuwsblad, in Brussels, Belgium, March 29, 2016.
These radical group sympathizers "have a security badge and can get into the cockpit of an airplane," Nieuwsblad newspaper reported, citing an open letter from airport security.
"In the past, [the authorities] revoked the badge of a number of people because they sympathized with ISIS. But clearly not everyone. Especially in the shops, cleaning services and luggage services," airport police said.
According to the officers, anyone can walk into the airport, even those who have a criminal record.
"For us it is clear that the terrorists, with the help of their spies, tested the safety of our airport screeners before taking action," the letter said.
Comment: If you're looking for ISIS 'supporters' and facilitators, you probably need look no further than airport security itself, provided by the Israeli company ICTS. Maybe investigators are just finding too much evidence at the airport to suggest these men simply walked in and detonated their bombs? Maybe the explosives were pre-planted? See: Israel intel-linked journal says explosives were pre-planted in Brussels airport