"You couldn't have had a larger group of physicians in one spot," said Dr. Albert Pendleton, an orthopedic surgeon who was part of the medial contingent for the marathon.
"I helped some people get back to the medical tent and then they told all the doctors to go back out there," Pendleton told CNN. "And so we went out there and there was probably four people on every single person who was down in that area, you know, starting IVs, you know, getting back boards in there, getting gurneys and getting (victims) shuttled into the medical tent."
President Barack Obama praised such efforts on Tuesday, saying in remarks that "the American people refuse to be terrorized."
"What the world saw yesterday in the aftermath of the explosions were stories of heroism and kindness and generosity and love," he said, citing "the first responders who ran into the chaos to save lives."
The president also exhorted citizens to remain vigilant, saying that "this is a good time for all of us to remember that we all have a part to play in alerting authorities."
"If you see something suspicious," he added, "speak up."