A 17-year-old male who was beaten with his own skateboard suffered serious injuries Saturday, following an afternoon altercation in Golden Gate Park.

Police say that the confrontation occurred at 4:45 p.m. Saturday, near Alvord Lake in Golden Gate Park.

According to the San Francisco Police Department, the 17-year-old victim got "in an altercation with" two men in their 20s. Over the course of the dispute, one of the men took the victim's skateboard and hit him with it, leaving him with injuries police say are life-threatening.

The victim, police say, was transported to San Francisco General Hospital. The suspects fled on foot in an unknown direction, police say. As of Monday morning, they remain at large.