The two died in a car crash after a Mexican-led operation to destroy a clandestine drug lab.

Two instructors from the US Embassy in Mexico and two Mexican agents died on Sunday in a car accident in Chihuahua after an operation targeting clandestine drug lab

A U.S. Embassy spokesman said the men were “collaborating with the Chihuahua authorities in the fight against cartel activities.” The narco-labs targeted by the operation allegedly belong to the Sinaloa Cartel.

Authorities in northern Mexico said the Americans were not involved in the raid. In an earlier statement, authorities suggested they were part of the raid.

After six synthetic drug labs were raided, the victims' vehicle skidded off the road and plunged into a ravine, officials said.

Two U.S. Embassy officials and two Mexican officials were killed in a car crash while returning from a drug operation.

Two employees of the U.S. Embassy in Mexico and two Mexican law enforcement officers were killed in a car crash over the weekend in Chihuahua.