"No evidence" for the FBI's concerns ...

"The FBI has interviewed Syrian activists in Washington and expressed concerns about their safety, according to local opponents of the rule of Syrian President Bashar al-Assad.After initial meetings that began several weeks ago, FBI agents have maintained contact with key activists, one of whom says she received a telephone death threat in May...
The State Department, citing reports that Syrian Embassy officials had carried out surveillance of protesters in the United States, summoned Ambassador Imad Moustapha on July 6... Moustapha met with a U.S. official in early July but was “presented with no evidence” of such activities..."