Ugly scenes broke out at University of Washington
The victim was shot in the stomach and was removed from the crowd following ugly clashes at Red Square, where anti-Trump and self-described anti-fascists have been clashing for hours, according to the Seattle Times.
According to Seattle police, the person was dragged out of the crowd and rushed to hospital with life-threatening injuries.
Hundreds of people gathered at the campus to oppose a speech by right-wing commentator Milo Yiannopoulous.
Fights then broke out between supporters of Yiannopoulous and protesters, according to local reports.
Seattle police are investigating the incident
It comes after anti-Trump protesters marched through the streets of Seattle against the 45th US President's inauguration.
According to Seattle media, one man claimed he was beaten for wearing a hat in support of Trump.
He said: I did nothing to agitate them. The most I did was stand up there, wearing this hat. All I wanted to do was hear what they were chanting about and read their signs."
One man injured at the clashes in Seattle
His father said: "The beat him like a bunch of pirhanas, they just attacked my son.
"I tried to get in there and tried to defend him and they started slugging me too."
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Alex Franke, a University of Washington student and volunteer medic, was among the first to treat the victim and told the Seattle Times: “He was just lying there.
“There was so much blood, it was hard to tell.”
More to follow.