Vinas is the latest American allegedly found to have been recruited into an Islasmic jihad. The two best known were John Walker Lindh, a Californian who was found fighting with Taliban when the U.S. invaded Afghanistan, and Jose Padilla. Padilla, of New York, was originally accused in 2002 of plotting to detonate a "dirty bomb" in the U.S., but convicted of lesser charges.
Adam Yahiye Gadahn, a Californian, has become something of a spokesman for al Qaeda.
ABC News' Emily Friedman contributed to this report.