April 20 (UPI) -- Two employees of the U.S. Embassy in Mexico and two Mexican law enforcement officers were killed in a car crash over the weekend while returning from an operation to destroy laboratories in the northern state of Chihuahua, officials said.

The four people were traveling in a vehicle when they skidded off the road and into a ravine at about 2 a.m. Sunday, Chihuahua Attorney General Cesar Jauregui Moreno told reporters in a press conference.

He identified the deceased as Agency Director Pedro Roman Oseguera Cervantes and officer Manuel Genaro Mendez Montes of the Chihuahua State Investigation Agency and two instructor officers from the U.S. Embassy, whose names have not been made public.

"From here, we extend our deepest condolences and wish peace and resignation to the families of those who died in this unfortunate accident," he said.

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