The FBI is constructing a detailed timeline of the still-hazy years between when Syed Rizwan Farook and Tashfeen Malik became self-radicalized on the Internet and when they launched the deadly attack in San Bernardino.

Investigators are working on a timeline leading up to the San Bernardino mass shooting. (Credit: Brian van der Brug/Los Angeles Times)
The effort could take months, according to two federal officials, as investigators in California, Pakistan and Saudi Arabia scour for leads and witnesses — and attempt to resolve several pivotal mysteries in the case.
Who knew of the married couple’s growing devotion to jihad? Did anyone know of their plot to kill Farook’s co-workers?
Did the couple plan other massacres that day? And where did they go between the shooting rampage before noon on Dec. 2 and the shootout with police that killed them four hours later?
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