>> reporter: i'm at the scene that you mentioned at riggs road in al delphi, maryland. take a look at some of the video that we have been able to get since we arrived here. we believe that the victim of this police-involved shooting was driving that red overturned vehicle that you see. there also was what appears to us to be an unmarked suv beside it. we were told that we were involved in a police chase in an earlier incident at east- west highway. we are told that was a stabbing. on the way to this scene, we stopped by this scene. we believe that's when the whole incident began. if you take a look at the video at east-west highway, this took place at a sunoco gas station there we were told there was a stabbing. there was a porch with a bloody rag. the driver of that vehicle was stabbed and has been transported to the hospital. now, from witnesses, we are told that a takoma police officer was near that scene at the sunoco station, saw the stabbing and then took off in pursuit of that suspect. he pursued him through takoma park and that's how he ended up here. the suspec