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Melvin Bledsoe, whose son Carlos is accused of killing one soldier and wounding another in a 2009 attack on a military recruiting center in Little Rock, Ark., warned the panel that a lot of people are “still in denial that we have a problem of radicalization” and told the panel, “tomorrow it could be your son or your daughter.”

“One thing for sure: It will happen again,” said Mr. Bledsoe, of Memphis, Tenn., “We must stop these extremist invaders from raping the minds of American citizens.”