Across Massachusetts, the silence was broken by the tolling of church bells.
"God bless the people of Massachusetts," said Gov. Deval Patrick at a ceremony outside the Statehouse. "Boston Strong."
Also on Monday, the governor and Roman Catholic Cardinal Sean O'Malley were among the mourners at St. Joseph Church at the funeral for one of the victims, Krystle Campbell. The 29-year-old restaurant manager had gone to watch a friend finish the marathon when she was killed in one of the blasts.
"She was always there for people. As long as Krystle was around, you were OK," said Marishi Charles, who attended the Mass. "These were the words her family wanted you to remember."
As emotions swirled in Boston, there was cause for some celebration. Doctors announced that everyone injured in the blasts who made it to a hospital alive are likely to survive. That includes several people who arrived with legs attached by just a little skin, a 3-year-old boy with a head wound and bleeding on the brain, and a little girl riddled with nails.
"All I feel is joy," said Dr. George Velmahos, chief of trauma surgery at Massachusetts General Hospital, referring to his hospital's 31 blast patients. "Whoever came in alive stayed alive."
As of Monday, 51 people remained hospitalized, three of them in critical condition. At least 14 people lost all or part of a limb, and three of them lost more than one.
Dzhokhar Tsarnaev had gunshot wounds to the head, neck, legs and hands when he was captured Friday night hiding in a boat in a backyard in the Boston suburb of Watertown, authorities said.
A probable cause hearing — at which prosecutors will spell out the basics of their case — was set for May 30. According to a clerk's notes of Monday's proceedings in the hospital, U.S. Magistrate Judge Marianne Bowler indicated she was satisfied that Tsarnaev was "alert and able to respond to the charges."