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Documents released by Sinai Province. Image courtesy of Sinai Province/Twitter.

An Egyptian militant group aligned with Islamic State claimed responsibility for the death of an Apache employee killed in August.

William Henderson, 58, was shot dead during an apparent car jacking in Egypt’s Western Desert on August 6.

The militant group Sinai Province posted pictures of Henderson’s passport and two identification cards to its Twitter account on Sunday and said it was responsible for Henderson’s murder.

U.S. officials are still investigating the case and would not comment on the Sinai Province statement.

Houston-based Apache has not commented on the group’s claims.

Security sources said another foreigner who worked for Qarun Petroleum, a joint venture between Apache and Egyptian General Petroleum, was also found in the car.

Sinai Province did not mention a second victim in its statement.

An investigation conducted by Apache concluded that the incident was “isolated.”

Henderson had worked for Apache for 28 years and was serving as a production expert for Qarun Petroleum before his death.