The author of the threats, posted at 9:31 p.m. EDT on Oct. 12, identified himself online as "javness."
"In the aftermath civil wars will erupt across the world, both in the Middle East and within the United States," javness wrote. "Global economies will screech to a halt. General chaos will rule."
The nation's general alert level remains at yellow, signaling an elevated risk of an attack. The threat level for airline flights is at orange, where it has been since a foiled plot to bomb U.S.-bound commercial jets was revealed on Aug. 10.