A Reuters reporter saw police detain Navalny on Moscow's Tverskaya Street and put him in a police truck.
One person has been killed and at least fifteen others shot at the Cameo Nightclub in Cincinnati according to police.
The gunman had barricaded himself in a bus for hours and a section of the tourist destination was closed. Police said he opened fire without warning.
Defense officials acknowledge coalition airstrikes in Iraq hit a location where scores of civilians were reportedly killed.
There was a fistfight on a California beach and someone used pepper spray, but rallies at other cities where thousands turned out were peaceful.