"We have all had to become ambassadors for our religion, we have had to condemn every terrorist attack or be labeled a supporter of terrorism, " she said.

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Investigators were trying to determine whether he is mentally ill, and if the motive for the alleged attack might fall under the legal definitions of domestic terrorism, a hate crime or something else, law-enforcement officials said.

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"In October, about a third said they were worried that a family member would become a victim of terrorism, and that number is unchanged in the wake of the attempted attack in December, " Holland said.

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Authorities arrested three men this week in Georgia's breakaway republic of Abkhazia on charges of plotting the attack in a joint operation with Abkhazian security services, the Russian National Anti-Terrorism Committee said, according to the state-run RIA Novosti news agency.

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