Saturday marks the 30th anniversary of the Oklahoma city bombing. The city held a commemorative service for the 168 victims.

World Health Organization member states agreed to the treaty after three years of talks. NPR speaks with Precious Matsoso, who served as co-chair of the group tasked with creating the treaty.

Ukraine said it would reciprocate any genuine ceasefire by Moscow, but voiced skepticism after Russian President Vladimir Putin announced a temporary Easter truce in Ukraine starting Saturday.