US man accused of making subway bomb threat online

An Afghan man accused of threatening on Facebook to detonate pipe bombs on the Washington subway system was ordered Tuesday to undergo a mental evaluation. Awais Younis, a native of Afghanistan, was arrested last week and charged with communicating threats across state lines.

Younis, 25, described to a friend last month during a Facebook chat how he could build a pipe bomb with specific types of shrapnel to cause maximum damage on the Metro system, according to a sworn statement from an FBI agent. He also discussed planting pipe bombs underneath a sewer head in D.C.'s Georgetown neighborhood. (AP)