Calls grew louder for stronger international cooperation to fight terrorism and tighten security measures after Tuesday’s attacks in the Belgian capital of Brussels that claimed at least 31 lives and left 270 wounded. However, clarity is yet to emerge on the contours of this next level of global cooperation — including ways to contain the Islamic State (ISIS), which claimed responsibility for the attacks. In the coordinated attacks between 8 a.m. and 9 a.m. on Tuesday, two explosions occurred in the departure lounge of Zaventem Airport on the outskirts of Brussels, and a third occurred at a city subway station. Airport cameras picked up three suspects. Two of them were brothers — Khalid el-Bakraoui, 27, and Ibrahim el-Bakraoui, 30 – while the third was unidentified, the New York Times reported , quoting Belgian officials. Ibrahim and the third suspect blew themselves up in the airport explosions, while Khalid carried out a suicide attack at the Maelbeek subway station an hour later, the report noted.…