The huge black and white sign was dropped over the middle section of the stadium's famous high wall in the left field - known as the Green Monster - during the fourth innings of the game against Oakland.
Peter Abraham of The Boston Globe wrote on Facebook the crowd booed at the banner until security officers pulled the banner up and also ejected the banner holders from the field. The game was not delayed.
Not a whole lot is known at this point for context, but someone dropped an anti-racism protest banner over the side of the Green Monster at Fenway tonight.
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"There were originally about eight people involved who had this idea, and those eight people come from various organizing groups in the Boston area".
"What it sounds like is, it was in support of Black Lives Matter, which is against racism", Walsh said.
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Fenway was in the news earlier this season after a fan shouted a slur at Orioles outfielder. "The individuals involved were escorted out of Fenway Park", the statement read. "It has been for a long time".
According to a study by Pew Research Center - conducted from August 15 to August 21 among 1,893 USA adults - more than half of the participants said racism was a "big problem in our society". And I know we have a policy that you can't affix a banner from anywhere in the ballpark.
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That's about 505 miles (810 Km) east-northeast of the southeastern Bahamas and 435 miles (700 km) south of Bermuda. Maximum sustained winds had decreased to near 75 miles per hour, making it a weak Category 1.
Many people aren't, or initially weren't, sure what to make of the message.