The chair of the U.S. Senate subcommittee on emerging national security threats said at a hearing Wednesday that much has been learned about enhancing emergency response and counterterrorism efforts in the decade since the Boston Marathon bombing, but more can still be done.
Democratic Sen. Maggie Hassan of New Hampshire used her opening remarks at the Subcommittee on Emerging Threats and Spending Oversight Hearing in Washington to reflect on changes since two pressure-cooker bombs went off near the finish line of the race on April 15, 2013.
