IR agents at the National Press Club?

A follow up to THIS notice by the US-based Iran Policy Committee:

"Iranian Dissidents Square Off in DC"---Article


United Press International asks, and so do I:

The unanswered question is how did known Iranian intelligence agents enter the United States, a fact that has Iranian dissidents worried.

The U.S. government knew of their presence on U.S. soil because federal agents were keeping a discreet eye on the press conference, according to several eyewitnesses.

Questions put to the U.S. State Department Bureau of Consular Affairs were not answered by press time.