Police in Portland, Oregon are investigating after four teenagers were stabbed Saturday morning at a pop-up outdoor “rave” party involving hundreds of people.

Three adult men in their teens and one boy in his teens were stabbed at the large gathering along the Eastbank Esplanade, Portland Police told Fox News Digital.

All four people were conscious and talking at the scene, according to authorities. Two were taken to the hospital with serious injuries and the other two were taken to the hospital for minor injuries.

Portland Police are investigating after a mass stabbing at an early morning rave. (Facebook)

One of the men who was taken to the hospital was detained by police, pending an investigation. 

The man’s identity has not been publicly released, and it is unclear if he is facing any charges.

Portland Police are not currently looking for any suspects, but asked those who were at the party to help detectives piece together the series of events.

It is unclear what led to the stabbing, with many witnesses fleeing before police arrived. (iStock)

“Many potential witnesses left without talking to police,” officials said. 

Witnesses are asked to e-mail crimetips@police.portlandoregon.gov attn: Major Crimes Unit and reference case number 25-192630.