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Up to 12 minutes of the pursuit, which ended in Richfield, was livestreamed on Facebook.
With residents alarmed over gang violence outside gate, officials stress the event's safety.
Emergency dispatchers told officers that the caller's husband had threatened to kill his daughter.
Gov. Tim Walz decried the gunfire, which left 3 hurt, and fair officials said safety is their top priority.
Minnesota groups also are mobilizing to get aid in the hands of those hurting because of the massive storm.
The chaotic scene erupted around 10:20 p.m. outside the gate at Snelling Avenue and Midway Parkway as the fair was closing for the year.
The initial call reported that a man with a hammer and knife was fighting with his grandparents.
After an eastbound train passed by, the woman was struck by an incoming westbound train, Metro Transit said.
'They were trying to salvage ... [their sons'] lives,' a friend said of the slain couple from Long Prairie, Minn.
Mayo Clinic announced Friday that it will shutter its primary care clinic based in La Crescent, Minn., this fall and consolidate its health services…