Obama Notified of Boston Marathon Explosions

April 15 (Bloomberg) -- Powerful explosions killed two and injured 23 near the finish of the Boston Marathon, police said. The first blast near Copley Square caused a huge puff of white smoke and was followed by a smaller one. Police at the corner of Boylston Street and Clarendon Street said there were many casualties. Bloomberg's Julianna Goldman reports. Note: Footage may contain graphic content. (Source: Bloomberg)
Prospects for Bitcoin in China
58:37 - Jack Liu, head of international at OKCoin, discusses bitcoin in China and as an alternative payment system. He speaks to Bloomberg's Angie Lau on "First Up." (Source: Bloomberg)
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