Long Beach terror plot case highlights new challenges for investigators as online recruiting grows

The Southern California man accused of plotting a bomb attack at a Long Beach rally last weekend fit the profile of other extremists bent on violence over the past two decades, counter-terrorism experts said Wednesday.
But Mark Domingo also represents a new threat of deep concern to terrorism investigators — the growing use of online forums and other internet tools to link isolated, frustrated young people with extremist groups.
FBI investigators in Los Angeles said they were first alerted