"Investigators believe they have identified a suspect in the Boston Marathon bombings..."

"The breakthrough came from analysis of video from a department store near the site of the second explosion. Video from a Boston television station also contributed to the progress, said the source, who declined to be more specific but called it a significant development."

AND: "An official briefed on the Boston Marathon bombing investigation said today that authorities have an image of a suspect carrying, and perhaps dropping, a black bag at the second bombing scene on Boylston Street, outside of the Forum restaurant." 

OR: Not.