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Foreign Office officials have urged the Libyan Government to hold a "thorough investigation" into the killing of Briton Mark de Salis, noting that its Charge d'Affaires has raised the shooting with the Libyan authorities.
A Foreign Office spokesman said: "We call upon the Libyan Government to carry out a thorough investigation into this tragic incident and to continue to do all it can to bring to justice the perpetrators of this appalling crime, as it strives to build strong rule of law in Libya."
The family of Briton Mark de Salis - who was shot dead in Libya - have said they are "shocked and saddened" by his killing.
Mr De Salis and a woman from New Zealand were shot dead near the coastal area of Mellitah in the west of the country, according to a Libyan security source.
Mr de Salis had been working in Tripoli in Libya for six years. He worked for First Engineering and was currently employed as a power manager bringing generators to Tripoli to provide electricity.
A statement from Mr de Salis' family reads: "Mark enjoyed his work in Tripoli and liked the Libyan people.
"Mark enjoyed travelling and had travelled extensively. He was a decent and incredibly loyal man and he was loved by many. He will be sadly missed by his family and friends.
"Mark was with a close friend from New Zealand who was also killed and our thoughts are with her family at this sad time. We would ask that our privacy is respected at this time."
A British man who shot dead in Libya has been named as energy worker Mark De Salis by the Foreign Office.
The Foreign Office is "deeply saddened" by the murder of a British man and a New Zealand woman in Libya and calls for the Libyan government to carry out a "thorough investigation" into the crime, an FCO spokesperson has said.
The spokesperson confirmed police have informed both families and consular officials are providing "full support" in Libya and the UK.
A British man shot dead in Libya was not a teacher as had been reported, sources have told the Press Association.
There are separate claims that he and a New Zealand woman who was also killed were both workers at Mellitah Oil and Gas.
The firm, which ranks itself as the biggest oil company in Libya, is co-owned by Italian company ENI.
Mellitah is near the town of Zuwarah and 60 miles west of the capital Tripoli.
The Foreign Office has confirmed that a British man has been found dead with gunshot wounds in Libya.
The man and a woman from New Zealand were shot dead near the coastal area of Mellitah in the west of the country, according to a Libyan security source.
A Foreign Office spokesman said: "We are aware of the tragic death of a Briton in Libya and we stand ready to provide consular assistance."
It is not believed the victim's family is yet aware of his death.
A New Zealand Ministry of Foreign Affairs and Trade spokesman said the ministry was aware of reports that a New Zealander may have been killed in Libya. "We are working with the relevant authorities to confirm this," he said.
The Foreign Office is investigating reports that a Briton has been shot dead in Libya. It is believed that a Briton and a New Zealander, both with gunshot wounds, were found dead in near the coastal area of Mellitah in western Libya, according to a Libyan security source.
A Foreign Office spokesman said: "We are aware of reports that the bodies of two foreign nationals have been found in Libya and are urgently seeking further information from the authorities."
Mellitah is near the town of Zuwarah and 100 km (60 miles) west of Tripoli. The killings come a month after a US teacher was shot dead in the eastern city of Benghazi, after which the Foreign Office said further attacks against Westerners were likely.
A Briton and a New Zealander, both with gunshot wounds, were found dead in western Libya on Thursday, a Libyan security source told Reuters.
"Their bodies were found near the coastal area of Mellitah," he said. No further details were immediately available.
Mellitah, near the town of Zuwarah and 60 miles west of Tripoli, is home to a large oil and gas complex co-owned by Italy's ENI.