responsible for monday's attack will be brought to justice saying, "the american people refuse to be terrorized." the senate intelligence committee received a full briefing on the bombing last night and the investigation surrounding it. when it was over saxby chambliss told the government it may lead the government to reevaluate security at major events. so many of which are considered soft targets. he also suggested new assistance might be offered to prominent events that attract huge crowds. this is still such an incredible time for the people of boston as they try to recover from these events and the nation is now becoming a part of this recovery for them. >> no doubt about it. coming up, how boston's grief is turning into national grief with a show of support. also this morning, most bostonians are known for their strong will and community pride, and you hear how so many people are willing to carry on, despite such a tragedy. and, first, the scare on capitol hill. the letter laced with poison sent to a well-known lawmaker. the investigation, the suspect and the precautions. you're watching "world news