Interviews with hundreds of children removed from a polygamist sect in Texas have revealed that several underage girls were forced into "spiritual marriage" with much older men as soon as they reached puberty and were then made pregnant, according to investigators.

A total of 416 children, mainly girls, have now been taken into state custody after five days of raids on the Yearn for Zion ranch in Eldorado, west Texas. Court documents reveal the children were removed for fear they were at risk of "emotional, physical and/or sexual abuse".