ration that preceded his killing. Salgado Araujo's relatives and friends have also said he lacked a criminal record, which has not been disputed by DHS.

Federal officials at DHS and the Justice Department are investigating the fatal shooting, though an FBI probe is reviewing a potential assault on a federal agent. The Harris County District Attorney and the Texas Rangers have also announced separate investigations into the killing.

Harris County District Attorney Sean Teare told CBS News he's  more than prepared  to file charges against ICE agents if he finds criminal wrongdoing on their part. He has sharply criticized ICE's tactics, arguing that  either these agents are completely untrained, or [they are] intentionally putting themselves in situations where they can justify firing into cars. 

On Tuesday, the FBI revealed in court papers that it is investigating whether drugs were in the van. In an application for a search warrant granted by a judge, an FBI agent said he spotted several bags inside the van that contained a  white crystal-like substance  he believes is consistent with methamphetamine. At the time, the agent said that law enforcement had not yet entered the van, but had taken photos of the bags from outside the vehicle.

There is no indication that ICE's decision to pursue the Ford Transit van ahead of the fatal shooting was related to concerns about drugs. The FBI agent wrote:  The United States is currently gathering all facts related to this incident, including what may have caused the occupants of the vehicle to flee. 

Less than a week after Salgado Araujo was killed, an ICE officer fatally shot another immigrant in Maine, also during a traffic stop. The killing of 25-year-old Colombian immigrant Johan Sebastián Durán Guerrero escalated concerns over ICE's tactics, prompting the agency on Tuesday to pause most vehicle stops, pending a review.

But that pause was short-lived. On Wednesday, after President Trump publicly criticized the moratorium, ICE agents were told they could continue to make vehicle stops and arrests.

Lorenzo Salgado Araujo, on the far left, is pictured with members of his family. Ronaldo Salgado

 Drawn by the promise  of America

Ronaldo Salgado said his father came from  humble beginnings  in Mexico and immigrated to the U.S. to ensure his family, including his children, did not have to deal with the same challenges and backbreaking work he faced.

 He wanted people to achieve the American dream, just like he gave us the opportunity to achieve the American dream, to become college educated, to become family men, men of good character,  Ronaldo Salgado said.

Lorenzo Salgado Jr. said his father was a man who was proud of his family, loved music and valued  honest work. 

 He was drawn by the promise that in America you can, if you put in the work, you'll get paid what you deserve, and the idea that in America, you can build yourself up from nothing to become someone, and to give your family a better future,  he added.

Both brothers are American citizens. Since their father was killed, they have been helped and represented by the American Civil Liberties Union of Texas and the League of United Latin American Citizens.

Asked what justice would look like for them as it relates to their father's killing, Lorenzo Salgado Jr. called it a  difficult question. 

 I think we'll have justice when my mom feels ready to go outside, without fear,  he said.  When people don't have to live in shadows, and of course, the first step there, like my brother said, is completing an investigation completely transparent and in full.