Arkansas ? Federal authorities conducting a child-porn investigation raided the headquarters Saturday of a ministry run by a convicted tax evader once labeled by prosecutors as a polygamist who preys on girls and women.

Social workers interviewed children who live at the Tony Alamo Christian Ministries complex, which critics call a cult, to find out whether they were abused. The two-year investigation involves a law that prohibits the transportation of children across state lines for criminal activity, said Tom Browne, who runs the FBI office in Little Rock.

The raid, conducted by state and federal authorities, started an hour before sunset at the complex in tiny Fouke, in southwestern Arkansas. Armed guards regularly patrol the headquarters, but there was no resistance as agents moved in, state police said.