Nation Confronts a New Menace After San Bernardino Shooting by Philip Shishkin and Jon Kamp, Wall Street Journal
Even with many details about the San Bernardino, Calif., massacre still unknown, law-enforcement officials see a chilling terror danger from extremist sympathizers who, unnoticed by authorities, are able to amass deadly arsenals to attack vulnerable gatherings anywhere in the U.S.
Much about the case has crystallized trends that officials have feared for years: The attackers, a young married couple with a baby, had never surfaced as subjects of any terror investigation and lived apparently ordinary suburban lives while secretly stockpiling guns, ammunition and homemade bombs.
The attacks Wednesday believed carried out by Syed Rizwan Farook, a religious Muslim and U.S. citizen, and his wife, Tashfeen Malik, a native of Pakistan, targeted a gathering of county workers far from any high-profile metropolis. The couple entered the room armed to kill a lot of people, quickly...