"That's very troubling," admits Steve Amundson of the Florida Security Council. "Adam Gadhan lived here in Southern California for a number of years. He studied under Dr. Muzammil Siddiqi at the Islamic Center of Orange County, which is in Garden Grove."
Gadahn's statements to U.S. Muslims follow the death of Osama bin Laden. In response, the Christian Emergency Network has issued a warning for churches in the United States, and Amundson advises Christians to stay alert.
"Churches, just like everybody, I tell them to be vigilant; be aware of your surroundings," he urges. "Don't walk around like everything's okay, because we're in different times now, and it's time for Americans to be vigilant, be aware, [and] be alert because something could happen."
Churches are also advised to have an emergency team ready and to regularly conduct emergency drills.