Business and economy
Alexion Pharmaceuticals agrees to purchase Synageva BioPharma, a maker of rare disease treatments, for US$8.6 billion. (New York Times)
Disasters and accidents
Japanese authorities raise alert level for the Mount Hakone volcano in the Lake Ashi tourist area. (Bangkok Post)
A French investigation finds that Andreas Lubitz, perpetrator copilot of the murder-suicide disaster of Germanwings Flight 9525 had practised rapid descent on a previous flight. (BBC)
Tornadoes of 2015: Tornadoes are reported across several states in the Great Plains region of the United States including Oklahoma, Kansas and Nebraska. (NBC News)