From this:

Two men on the "national terrorist watch list" have been turned over to the Federal Bureau of Investigation (FBI) following a routine traffic stop... [Patagonia, Arizona Police Chief Ed Dobbertin said] that the men were of Middle Eastern descent and had been residing in Sierra Vista. ..."They were on the list because apparently they were non-U.S. citizens going to Nogales to basically bond out an individual - their associate - who was also a non-U.S. citizen that had been stopped the night before by Customs and Border Protection agents for entering the United States illegally," said Dobbertin.