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Pete Williams, Kerry Sanders on the Boston Marathon attacks and investigation

NBC's Kerry Sanders and Pete Williams field viewer and reader questions on the ongoing investigation into the Boston terror blasts and the city's recovery.

More than a week after the terror attacks at the finish line of the Boston Marathon, there remain more questions than answers: What motivated Dzhokhar and Tamerlan Tsarnaev to carry out the attacks? Were more attacks planned? Were the suspects trained by Islamic militant groups? What lessons were learned by the US and intelligence agencies to prevent future attacks? What’s next in the investigation?

NBC News Correspondents Pete Williams and Kerry Sanders addressed some of those questions and more in a Google+ Hangout on Boston Marathon attacks and its aftermath earlier today.

Click on the link above to replay the informative chat.

Pete Williams explains the intelligence chain of events ahead of the Boston Marathon bombing between the U.S. and Russia.

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Heightened security, empty streets, and memorials mark the the days after the Boston Marathon bombings.