Inside the Americas

Boston bombings: who are the Tsarnaev brothers?

The Boston bombings investigation makes progress, but questions remain as to how and why the suspects turned to radicalism. This comes as two men are arrested in Canada on suspicions they were planning to derail a passenger train. Also, the conservative party which ruled Paraguay for over half a century is back in power. Finally, Brazil is preparing for next year's World Cup, with one key question: where are all the visitors going to sleep?