Those killed are identified as Lt. Edward Walsh and Firefighter Michael Kennedy . `` We lost two heroes here today , '' says Boston mayor . The first responders were among the most highly trained in the country - they had been through countless training exercises to prepare for a possible terrorist attack. Blaze appears to have begun in the basement of a brownstone .
Those killed are identified as Lt. Edward Walsh and Firefighter Michael Kennedy . `` We lost two heroes here today , '' says Boston mayor . More than a dozen other firefighters are hurt . Blaze appears to have begun in the basement of a brownstone .