Dallas PD working a barricaded person in NE Patrol territory, Fern Drive near Gus Thomasson. Didn't catch the beginning, as I don't normally monitor Ch 2. But apparently officers answered a disturbance call, and the suspect confronted them with a large knife before retreating inside. Comments include "suspect known to have a large rifle, plus Bowie knife". Dallas SWAT units on scene, sounds like a few more coming. DFR asked to send an engine & rescue for standby. Tactical (SWAT) on Ch 8.