WEST CHESTER, Pa. (AP) — The family of an American civilian shown beheaded on an Islamic militant Web site huddled in in tears Tuesday after learning of the existence of the graphic videotape. The video showed Nick Berg, 26, in a staged execution carried out by an al-Qaida affiliated group. The video said the killing was to avenge the abuse of Iraqi prisoners by American soldiers. "My name is Nick Berg, my father's name is Michael, my mother's name is Suzanne," the man said on the video before being killed. "I have a brother and sister, David and Sara. I...