Boston Marathon Explosions: Deep Sympathy for Victims

Emotional vigils held for those killed including Martin Richard and Krystle Campbell.
2:58 | 04/17/13

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Transcript for Boston Marathon Explosions: Deep Sympathy for Victims
You're watching America this morning -- America's number 1 in the early morning news. Investigators have zeroed in on how those bombs are made and how they exploded now they need an assist from the public photos videos anything else that might help the -- suspects turnout grief still has a grip on the city of Boston and we have team coverage beginning with ABC -- -- Bradley joins us now from Boston good morning -- -- Good morning Diana good morning John still no suspects but here in Boston you get the sense that the city is united. There's an outpouring of support for those who were injured some of them still in hospitals recovering. And there is deep sympathy for the families of those who were killed. Overnight -- to three. An emotional vigil in the Dorchester neighborhood for Martin Richard just eight years old killed in Monday's attack. -- -- -- -- At the boy's home neighbors dropped off flowers and children remembered him at a park where used to play. Another victim 29 year old crystal Campbell is also being remembered she was at the marathon cheering on her friend's boyfriend. He can't believe this cut its. Check out -- everything she did. This doesn't make -- The third person killed has been identified as -- Boston university graduate student from China. This morning authorities are piecing together more clues. ABC news has obtained these photos of a shredded backpack and pressure cooker that was modified and used as one of the bombs. It appears that this device and even dropped in a backpack. Either inside the trash cans or outright outside the trash cans. -- FBI advisory says there is insufficient evidence to determine -- the second explosive was made from a pressure cooker is well. Boston's is pulling together. Police -- the streets but residents are trying to get back to their lines. We're strong people and we're not gonna let anyone push us around. That's what one must must call us officials have received a number of tips and are following up -- Obama has here tomorrow for service to honor the victims John Diana. That's -- understandably security has to have been heightened after this happened but is it still noticeably -- You know it is but I don't think it's quite like it was yesterday -- and you don't see as many cops on the street yesterday you saw on National Guard out. Operating in some men with machine guns standing on many of the corners here. In downtown Boston now we expect there'll be. Another strong show of force. But law enforcement officials say that there are no unexploded devices across the city there were just those two planted bombs. People -- still on edge but it's not quite the police presence that we saw yesterday. -- -- Bradley in Boston thank you.

This transcript has been automatically generated and may not be 100% accurate.

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