Brandon Bell/Getty Images via CNN Newsource

By Julianna Bragg, Priscilla Alvarez, Alisha Ebrahimji, Caroll Alvarado, Danya Gainor, Carolina P

(CNN) - Days after a federal immigration agent fatally shot a Houston man, frustration is growing among local officials who say federal agencies are resisting collaboration on the investigation into the contentious shooting.

Immigration and Customs Enforcement officials have said an agent opened fire Tuesday morning after Lorenzo Salgado Araujo, a 52-year-old Mexican national, rammed a law enforcement vehicle and refused to follow verbal commands during a traffic stop that was part of a  targeted operation. 

But Texas officials say they're being kept in the dark by federal authorities, without access to key evidence, like Salgado Araujo's work van, or invitations to the scene of the incident.

 Sadly, what we're getting on the local side is updates via X and Twitter, so that's not the best practice,  Harris County District Attorney Sean Teare told CNN's Omar Jimenez on Saturday.  I remain hopeful that HSI and ICE will collaborate and will at least share some critical pieces of evidence with us. 

Teare told CNN's Erin Burnett on Friday his office would move to ask judges for access to the vehicle if federal authorities don't agree to share evidence.

 It is one of, if not the most, crucial piece of evidence to really uncover what actually happened out there that morning,  he said.

When asked by CNN about the van's whereabouts, the Department of Homeland Security deferred to the FBI and Office of the Inspector General. The FBI deferred back to DHS. CNN has reached out to the Inspector General's office.

Houston Mayor John Whitmire expressed a similar frustration Friday as the city's police department had offered its resources to help with the investigation.

 The FBI has all the evidence that would normally go in to an HPD or other law enforcement agency's investigation,  Whitmire said at a news conference ?Friday.  In this instance, the van, the passengers, the deceased, and they're tightly controlling it. We've reached out to them and asked th

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