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In Colorado, Boulder County, 7 people, including a police officer, were killed in a shootout in front of and in a supermarket.
Police say they arrested one person, but they are not sure if there was a single or multiple shooters.
A video posted on YouTube showed one person on the ground inside the King Soopers store and two others outside on the ground, but the extent of their injuries was unclear. What looks like two shots is also heard at the start of the video.
https://www.youtube.com/watch?v=2046sAeJX9g
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