Boston bombings: 'more like Newtown shootings than 9/11'?

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The suspected Boston bombers' Chechen ethnic-origin has been widely reported, but some bloggers have argued that the pair's American roots have been downplayed when trying to understand what may have motivated them. So how American are the suspected Boston bombers? And were the bombings more akin to incidents such as the Newtown shootings than terror attacks like 9/11? Also, we hear from Bangladesh where a commercial building has collapsed in Dhaka. Dozens are feared killed.