On the other hand, the cynical side of my wonders if the sensor was tripped on purpose, knowing the border patrol would respond, then the perpetrator(s) lying in wait to ambush the agents.
In recent years, ICE / border patrol / BATF agents who disagreed or (God forbid!) filed a formal complaint have been mistreated to a point that is criminal, life-threatening, family threatening, etc.
Simple sensor trip, as the sensors are buried and hidden and not seen. They are way beyond the sensors we had in Vietnam, smaller, less intrusive, BURIED and able to detect all sorts of movements. The locations are secret.
Suspects in the shoot are running hard and will only die tired. Intel chatter from the cartels indicates the shooters will not live long if the cartels get them first. Cartels like to avoid killing Agents because to do so would be to bring down the thunder and wrath from gawd. Not economical to kill Agents because the BP would focus on that area and the controlling cartel would lose business to other cartels that will operate in areas of less focus.
We shall have a capture soon, I am sure. And the guys involved in the shoot, the Border Patrol Agents, are professionals, dedicated and had not been involved in whistle-blowing or some other such activities.