Mourners raise candles for bomb victims two days after a double explosion at the Boston Marathon killed three and injured 176 in Cambridge, Massachusetts. Investigators have spotted a Boston Marathon bombing suspect from security video taken before two blasts ripped through central Boston on Monday, a US law enforcement source said. Photograph: Adrees Latif/Reuters

In what could be a major break in the case of the Boston Marathon, police are hunting a man seen in a department-store surveillance video dro(...)