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“What we also know is that the Russian intelligence services had alerted U.S. intelligence about the older brother, as well as the mother, indicating that they might be sympathizers to extremists,” Mr. Obama said. “The FBI investigated that older brother. It’s not as if the FBI did nothing. They not only investigated the older brother, they interviewed the older brother. They concluded that there were no signs that he was engaging in extremist activity. So that much we know.”