Krayem is believed to be the man seen on CCTV at the Brussels City 2 shopping centre, where he bought the rucksacks used later for the 22 March 2016 terror attack in Brussels Airport in Zaventem. His DNA was found in the Schaerbeek (Brussels) apartment used by the Zaventem airport bombers. He was thought to have been the second man alongside bomber Khalid El Bakraoui at the Pétillon metro station. El Bakraoui is thought to have carried out the bombing of Maelbeek metro station minutes later on the morning of 22 March 2016. During interrogation, Krayem confessed that he was the second metro bomber and explained that he felt regret at the last moment and therefore never tried to detonate his suicide bomb.