U.S. officials have been in touch with the families of Americans kidnapped in Mexico after two were found dead, the White House said.

Speaking to reporters Wednesday, White House press secretary Karine Jean-Pierre said the Biden administration had spoken with the victims’ families but declined to say whether President Joe Biden had or whether he intended to do so.

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Four Americans went missing after crossing the southern border on a trip to Mexico for a medical procedure. Two were discovered killed on Tuesday and one was found injured and a fourth unharmed.

Jean-Pierre stressed that the United States would be “relentless in pursuing justice” in the case.

“We will do everything in our power to identify, find, and hold accountable the individuals responsible for this attack, and we continue to work in coordination with the Mexican government,” she added.

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Jean-Pierre and national security spokesman John Kirby called the killings “unacceptable” on Tuesday.