The bloodshed took place in the philosophy department building of Charles University in the Czech capital, where the shooter was a student, a police official said.
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The official was not authorized to discuss details of the investigation publicly and spoke to The AP on condition of anonymity.
Nine teenagers were found shot in an east Texas residence early Sunday at a prom after-party attended by hundreds, local officials said a statement.
The FBI released 600 pages of documents related to its Las Vegas mass shooting investigation, but the names of nearly everyone involved were redacted.
Officials say a suspect is in custody after the killings in a small town near the Tennessee state line.