Two men and five women were put into custody "during a disturbance" in the 400 block of N. Wabash Ave., police told Chicagoist.
Charges were pending "for possible damage to property and trespassing", police said.
The banner fluttering across the front of the Trump International Hotel and Tower Chicago had the word "RESIST" across the top, along with the Greenpeace logo.
Flying Fijians qualify for 2019 RWC
Fiji is enjoying an outstanding season in which it has beaten Italy and Scotland before retaining the Pacific Nations Cup title. The Fijians won both of their games a year ago , beating Tonga 23-18 and Samoa 26-16 in Suva to notch up eight points.
Traffic on the river was halted as the banner was cut down and drifted into the water around 2:30 p.m. The Twitter account of Greenpeace USA carried video of the banner.
At one point during the livestream a Chicago architectural boat tour passes by the tower without commenting on the banner.
On their Facebook page, Greenpeace said the goal of hanging the banner was to show the Trump administration and the people of Chicago that they will continue to resist the president's "attacks on clean air and water".
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