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(Boston, MA)  --   Authorities in Boston are telling Watertown residents who are at work in the city they can return home, even amid a lockdown for a marathon bombing suspect.  Police say there's no need to shelter in place at the workplace.  Public transit is not running, but taxi services are available. 

Multiple law enforcement agencies continue their search for 19-year-old Dzhokhar Tsarnaev. Police believe he's one of the people responsible for planting the bombs that tore through crowds at the Boston Marathon, killing at least three people and injuring more than 170.  His brother Tamerlan was killed during an overnight shootout with law enforcement.