What We're Following This Morning

Brussels attacks, cont’d: Belgian state media are reporting the two suicide bombers who carried out yesterday’s attacks at Brussels airport were two brothers known to police. They were identified as  Khalid el-Bakraoui, 27, and Ibrahim el-Bakraoui, 30. A third suspect in that attack is still at large. The attacks at the airport and one on the city’s subway system killed at least 32 people and wounded more than 230 others.    

U.S. presidential primaries and caucuses: Donald Trump, the Republican front-runner, triumphed in Arizona, the biggest prize of the night, while his GOP rival Ted Cruz won in Utah. In the Democratic races, Hillary Clinton won in Arizona while Bernie Sanders took Idaho and Utah.

Obama heads to Argentina: The president concluded his historic visit to Cuba yesterday, and arrived in Buenos Aires early this morning. The two-day visit is his first to the country as president.

News from last night here