"One officer was able to see inside the garage where the suspect was located on the floor," said Awad. "He appeared to have life-threatening injuries to the upper body. He has since died from those injuries. They appear to be caused by a chainsaw."
http://www.fox5dc.com/news/local-news/fairfax-county-police-investigating-assault-in-springfield
http://www.fox5dc.com/news/local-news/fairfax-county-police-investigating-assault-in-springfield