Stephen Flynn, a veteran homeland security expert and political scientist at Northeastern University in Boston, gave the president “high marks” for his statements, which on Tuesday included this:

“Boston is a tough and resilient town. So are its people. I’m supremely confident that Bostonians will pull together, take care of each other, and move forward as one proud city. And as they do, the American people will be with them every single step of the way.”

Said Flynn: “In the absence of knowing much about who’s behind this — which everybody wants to know — highlighting the extent to which how well bystanders and professional local people responded, and how Boston is a tough and resilient city, these are important messages for Americans to hear.”