An Egyptian terrorist organization which was reported to have sworn allegiance to the Islamic State group has claimed responsibility for the killing of an American oil worker.

William Henderson was reportedly killed in a carjacking in the Western Desert, Egypt, on Aug. 6, the SITE Intel Group said.

The terror organization Ansar Beit al-Maqdis, which now calls itself the Sinai Province, said on its official Twitter account late Sunday that it killed him. It published pictures of his passport and two identification cards.

The passport says Henderson was 58 years old and from Texas. His identification cards say he worked for energy company Apache Corporation, based in Houston, and was a production expert for Qarun Petroleum Co, a joint venture between the Apache Corporation and the Egyptian General Petroleum Corporation.

The Enid News & Eagle in northwestern Oklahoma published an obituary for a man named William Henderson in August, saying he had “passed suddenly” while working in Egypt. It said he had worked for Apache for 28 years and was 58 when he died.

The U.S. embassy declined to comment on the Sinai Province’s claim. Apache could not immediately be reached for comment.

Reuters reported last month that Ansar Beit al-Maqdis denied in a Twitter message that it pledged allegiance to the Islamic State, also known as ISIL or ISIS,

It came the day after a statement purporting to be from the group saying it had pledged loyalty to Abu Bakr al-Baghdadi, the head of the Islamic State, appeared on two jihadist Twitter feeds.

The group later pledged allegiance to the Islamic State and changed its name to Sinai Province on its Twitter feed, Reuters said.

The U.S. and coalition forces have been bombing Islamic State targets in Syria and Iraq for weeks, but no ground troops are deployed.

http://www.usatoday.com/story/news/world/2014/12/01/militant-group-oil-worker/19726369/