location. >> baseball field and a victim is down in the baseball field. >> total of five down. >> okay. does anybody need a chopper? >> we need a medevac. >> we have some witnesses that are trying to leave. i'm trying to keep them on the scene. >> those are some of the 911 calls that we're listening to there. i want to go to cnn's rene marsh who has details on how all of this played out. people may be surprised about how early this practice took place. it's something that began in the 6:00 hour. >> right. it began in the 6:00 hour. as you mentioned, the calls for help happened around the 7:00 hour. it happened in the del ray neighborhood. that's in alexandria, virginia, about eight miles from where you are now at the u.s. capitol. we know this happened at the eugene simpson stadium park which is where members of