If yo are referring to the black Mercedes, they were stopped, questioned , and released.
It seems that someone was traveling with a camo colored bag luggage, and while initially they were uncooperative ,
they complied with search and questioning, and were released.
Scroll down.
Can’t copy, typing it:
Dallas police officials anonymously leaking allegations of a “conspiracy” to the media — via @dallasnews
pic.twitter.com/usA8Z12xGH— Michael Tracey (@mtracey) July 8, 2016
A commander in the Dallas Police Department, however, described the shooting as a “conspiracy”. He said several people were involved in teh planning, logistics and execution of the coordinated attack. He declined to elaborate and requested anonymity.