18-Minute Mystery in San Bernardino Terror Investigation

Assistant FBI Director in Los Angeles David Bowdich asked for the public's help because of concerns the suspects may have disposed of a hard drive or met with others during an 18-minute gap in which the FBI has not been able to trace their journey.
1:42 | 01/05/16

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Transcript for 18-Minute Mystery in San Bernardino Terror Investigation
We turn now to a headline breaking late today from the FBI now a new plea tonight as they investigate that terror attack in San Bernardino. They are laser focused combat couple turned killers but tonight they have revealed there was an eighteen minute mystery. In app window of time could provide crucial clues ABC's chief investigative correspondent Brian Ross. The FBI knows when the attack began and almost everything until it ends. The husband and wife terrorist Syed Farooq and touched the in the league were shot dead in their black SUV. But in between official said today there is an eighteen minute mystery. And unaccounted gap in their whereabouts and not detected by traffic cameras or witnesses. We accounted for three hours and 42 minutes. Of their time. We are missing eighteen minutes of their time. And the FBI today made a plea for the public's help to solve the mystery showing pictures of their vehicle we want to ensure that if they made contact with anymore. That we don't already know about. That were able to fully investigate those matters. And the FBI also wants to know what happened to the hard drive removed from the killer's computer at their home the morning of the attack the two were tracked to the San Bernardino lake around 11:45. AM by the FBI. But the search by divers did not turn up the hard drive or any other evidence on the lake pop. And Brian Ross what this now on Brian you were telling us that window of time is so important because it could uncover their digital trail. That's right David authorities believe the killer couple may have ditched the hard drive during that gap in time which could reveal other possible targets and others who may have helped them. Either in this country or overseas.

This transcript has been automatically generated and may not be 100% accurate.

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