A drug laboratory located roughly nine hours from the city of Chihuahua (Picture: AFP)

Two US officials killed in a car crash as they returned from destroying a secret drug lab in Mexico were working for the CIA,it has been revealed.

Two Mexican investigators also were killed in the crash,which authorities said occurred while the convoy was returning from an operation to destroy drug labs of criminal groups.

Their vehicle,which was leading a five vehicle convoy,went off the road and fell into a ravine before exploding,Mexican authorities said.

The CIA’s involvement was confirmed by the three with knowledge of the crash,who spoke on the condition of anonymity,as reported by The Washington Post.

The group located two laboratories apparently used for the production of synthetic drugs

(Picture: AFP)

The US Embassy declined to identify the dead or say which Government entity they worked for,but did confirm the officials were ‘supporting Chihuahua state authorities’ efforts to combat cartel operations.

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Start your day informed with Metro's News Updates newsletter or get Breaking News alerts the moment it happens.The embassy,State Department and CIA declined to comment on the identities of reports of CIA involvement in the operation.Mexican President Claudia Sheinbaum faces extreme pressure from US President Donald Trump’s administration to crack down on cartels.Trump has taken a more aggressive stance toward Latin America than any leader in recent US history, capturing Venezuela’s president,blockading oil shipments to Cuba and launching joint military operations in Ecuador,a country also marked by criminal violence.Trump has repeatedly offered to take action on Mexican cartels,an intervention that Sheinbaum has said was “unnecessary.”The CIA officers were initially identified as US embassy personnel by U.S. Ambassador to Mexico Ron Johnson, who is himself a former CIA employee.Local Mexican officials originally claimed they were working with the USon an operation,but later walked those comments back after the effort came under scrutiny from President Sheinbaum.Sheinbaum said she knew nothing of a joint operation between Chihuahua’s government and the US despite reports that the Mexican army was also involved in the raid on the lab.