HOUSTON (AP) — The family of a man who was shot and killed by a federal immigration agent in Houston is holding a public vigil Thursday evening, in response to what the man’s son says is an outpouring of support amid renewed criticism of enforcement tactics.

The ceremony for Lorenzo Salgado Araujo, a Mexican national who was fatally shot last Tuesday by a U.S. Immigration and Customs Enforcement officer while driving his construction crew to a job site in Houston, comes amid mounting scrutiny on President Donald Trump’s aggressive immigration crackdown. Encounters with ICE have resulted in at least 10 deaths since the start of Trump’s second term last year — two of which happened in the days after a federal agent killed Salgado Araujo.

“My family would like to express our heartfelt gratitude for the unbelievable and incredible support we have received,” Salgado Araujo’s son, Ronaldo Salgado, said in a Facebook post Thursday.

Salgado Araujo, 52, who had no criminal record, had lived in the U.S. for 35 years.

In the fallout of the shooting, three men whom Salgado Araujo was driving when he was killed have adamantly disputed the government’s official account.

The Department of Homeland Security, which oversees ICE, said Salgado Araujo had rammed an ICE vehicle, and that a federal agent fired a weapon in self-defense. Republican Texas Gov. Greg Abbott, a staunch supporter of Trump’s immigration crackdown, said Wednesday that the state’s top law enforcement unit would investigate the fatal shooting.

More than a week after the shooting, new court records show the FBI is investigating whether drugs were found in the van, according to a search warrant application signed by a federal judge on Tuesday.

FBI Special Agent David McNeilly stated in an affidavit that he observed four plastic bags of a white substance appearing to be meth inside the van. DHS has not stated that suspected drugs were the reason why ICE officers engaged in the traffic stop. The FBI referred all questions to the U.S. Attorney’s Office for the Southern District of Texas.

U.S. Attorney Aaron Reitz emphasized in a recorded video statement on Thursday that all information was preliminary and not conclusive.

“We are doing everything we can to seek the truth and do the right thing,” Reitz said. “In the meantime, I encourage the public to give the FBI and DHS the opportunity to investigate.”

An attorney for Salgado Araujo’s brother, who was in the van when the agent killed Salgado Araujo and who was subsequently detained by ICE, said that the powder is a homemade electrolyte mix that the construction crew used to stay hydrated while working outside in the grueling Texas heat.

Ruby L. Powers, the attorney for Salgado Araujo’s brother, in a statement called for officials to test the substance to establish that it isn’t an illicit substance.

“But no test result, whatever it ultimately shows, will change the fact that deadly force was used against Lorenzo,” Powers said. “You cannot shoot first and ask questions later.”

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Riddle reported from Los Angeles.

David Phillip, Lekan Oyekanmi And Safiyah Riddle, The Associated Press