After spending time in the video pit, one thing I'm sure of - there was a fight:
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Oct 21:
http://abcnews.go.com/WN/childs-body-found-dump-somer-thompson-vanished/story?id=8883485
[snipped...] She had been walking with her two siblings, including a twin brother, and friend when she got into an argument with another child. Somer walked ahead of the group and was never seen again.
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Oct 21:
http://www.associatedcontent.com/article/2309863/somer_thompson_missing_mother_on_today.html?cat=62
[snipped...] Somer Thompson went missing around 3 p.m. Monday afternoon when she was walking home from school. She, her twin brother, her 10-year-old sister and several friends were headed home when Somer and a friend got into a small argument. When Somer's older sister told her to "quit fighting," Somer reportedly got angry and ran ahead of the group. But when everyone got home, Somer had not yet arrived.
Diena Thompson was informed by text message at her work that her child was missing. She immediately left and, chancing upon a police vehicle, flagged it down. The search for Somer Thompson began almost immediately.
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Oct 21:
http://www.abcnews.go.com/US/mother-missing-florida-girl-somer-thompson-begs-return/story?id=8877337
[snipped...] Holding a picture of her daughter, Thompson told "Good Morning America" that her family, especially Somer's twin brother, are devastated.
"We just don't know what to do without her," she said.
Somer vanished Monday while on her way home from school with her twin and 10-year-old sister. She had argued with the two other children, Thompson said, and ran ahead of them, far enough that they lost sight of her.
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Oct 23:
http://edition.cnn.com/2009/CRIME/10/22/georgia.landfill.body/index.html
[snipped...] Somer became separated from her siblings and schoolmates on her way home from school in Orange Park, Florida, on Monday.
She was seen in a fight at school before she disappeared, according to a police report released Thursday. Her 10-year-old sister told police that Somer had gotten into a fight with another girl at school earlier in the day.
The sister said she brought up the fight while she and her brother walked Somer home from school, and that Somer ran off from them, apparently upset. The sister said she lost sight of Somer in a group of other kids leaving the school, according to the police report.
When the other children got home and she wasn't there, they dropped their backpacks and went out looking for her.
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Oct 23:
http://www.foxnews.com/story/0,2933,569245,00.html?test=latestnews
[snipped...]Authorities say Somer squabbled with another child Monday and then walked ahead of the group of kids and was never seen again.
Justino said Friday that the argument was verbal and began at school.
"Somer became agitated by that," she said.