Businesses that remained open tried to support their employees who were in shock.
Copley Place, a high end indoor shopping center blocks away from the explosion, opened at 10 a.m. on Tuesday, its usual time. But the mall, owned by the Simon Property Group, said "we are respectful of the wishes of any tenant that chooses not to operate today."
In a city of 625,087 people and on a state holiday, it's common to know at least one person who either ran in the marathon or was spectator on Monday.
At Communispace Corp., a consumer collaboration agency headquartered in downtown Boston, the company had three employees who ran in the marathon.
"As soon as the news broke, we started tracking our runners to find out what we could," said Jen Reddy, SVP, Global Marketing at Communispace Corp., which is headquartered in downtown Boston.
Reddy said all their runners are safe, "but it's a somber day in our office."
"It's amazing how social media became our lifeline to each other and other companies. One of our runners had just crossed the finish line and was going to get her medal when the first explosion happened," Reddy said. "She looked back, saw smoke and chaos, and ran straight to the Communispace offices to get help and try to find her family."
The company gathered Tuesday afternoon "to meet or talk or just share a moment of reflection for those we lost or who were injured yesterday," she said.
"We are a company of runners and we hope organize a walk or run to honor the injured soon," she said.