A shooter who sprayed bullets into a church filled with young students was "obsessed with the idea of killing children," investigators said Thursday, after reviewing writings and videos that detailed hate for a myriad of groups.

As young children attended Mass on Wednesday marking their first week back at school, the attacker opened fire through the stained-glass windows of a church in the Midwestern city of Minneapolis, in the latest deadly shooting that has shaken the United States.

The assailant, who died by suicide in the parking lot, left behind a manifesto, online videos and hundreds of pages of writings that investigators have been sifting through while searching for a motive.

"The shooter expressed hate towards almost every group imaginable," including Mexicans, Christians and J

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