Many people were injured, and some may have been set on fire at a mall in Boulder, Colorado.
The FBI described it as a “targeted attack,” with police taking a man into custody.
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Multiple blocks of the mall area were evacuated by police. Police officers patrolled the streets accompanied by a police dog, searching for potential threats.
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“Our agents and local law enforcement are on the scene already, and we will share updates as more information becomes available,” FBI Director Kash Pate posted on social media.
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Colorado Gov. Jared Polis said he was “closely monitoring” the situation.
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