There were many claims on social media that the pro-union protesters were using Nazi salutes.
This picture, by photographer Jon Brady, was widely circulated on Twitter.
It has also been claimed the gestures were the similar (and highly controversial) "Red Hand of Ulster" salute, often associated with loyalist politics and Rangers football club.
Many of the pro-union supporters displayed Rangers FC-related banners.
The majority of Yes supporters left the area by sunset but a small group remained. BuzzFeed News saw multiple individuals pushed to the ground and kicked as police attempted to hold the two sides apart.
Anti-independence songs were chanted.
Red smoke bombs flew over police lines outside Glasgow Queen Street railway station.
But police just about kept the the area under control after deploying substantial numbers of officers and mounted police.
At 10pm on Friday night police horses were working hard to keep the sides apart but largely succeeding.
Six people were eventually arrested, ITV News reported.
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