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Despite multiple photos and surveillance video images of two suspects involved in the Boston Marathon bombings last month, as well as state-of-the-art facial-recognition software and two government databases, investigators were unable to identify the two suspected perpetrators, even after releasing several of the images to the public.

It was only after one suspect was shot in a showdown with police and was fingerprinted on his way to the hospital that authorities finally had a name to go with a face — Tamerlan Tsarnaev, a Chechen youth who was already on two U.S. terrorist watch lists after Russian authorities warned the U.S. that he had become “radicalized.”

The watch lists were supposed to alert authorities if Tsarnaev attempted to travel overseas, but they failed as well, even after he returned last year from a six-month trip to Russia. The databases contained a misspelling of the suspect’s name — “Tsarnayev” instead of Tsarnaev — and two incorrect dates of birth.

The facial-recognition system failed because none of the images captured of the suspects at the bombing site were full-frontal shots that the system’s algorithms could recognize.

These are two of the technology failures discussed in a new documentary about the bombing manhunt produced by NOVA and airing on PBS stations tonight.