Update from the Commercial Appeal:
“The two suspects also were killed. Authorities declined to identify them, but The Commercial Appeal talked to three people late Thursday who said they recognized their relatives and the van from photos and videos. They said one of the suspects was a 16-year-old boy and the other was his father.”
http://www.commercialappeal.com/news/2010/may/20/west-memphis-police-officer-killed-another-injured/