The Brussels suicide bombers included two Belgium-born brothers with a violent criminal past and suspected links to plotters of the Islamic State’s Paris attacks last November, the authorities said on Wednesday, raising new alarms about Europe’s leaky defenses against a militant organization that has terrorized two European capitals with seeming impunity.
One of the brothers was deported by Turkey back to Europe less than a year ago, Turkey’s president said, suspected of being a terrorist fighter intent on entering Syria, where the Islamic State is based. Despite that statement, Belgian officials said neither brother had been under suspicion for terrorism until recently, an indication of the Islamic State’s ability to remain steps ahead of European intelligence and security monitors.
