America is grappling with grief a day after shrapnel-loaded explosives went off at the hugely popular Boston Marathon, killing three people. Many more are critical. The big worry is that many of them will lose an arm or a leg because of the shrapnel in the explosives. There is still no clarity on whether this was a domestic terror operation or involving a group like the Al-Qaeda. We report live from the blast site.
(Video courtesy: ABC News, Al Jazeera)