BP on Monday released the names of three employees who were killed earlier this month after an attack by militants at Algeria’s In Amenas gas plant.
The British supermajor identified engineer Sebastian John, 26, of Nottingham, vice president Carlos Estrada, 44, of Colombia and well operations manager Gordon Rowan, 58, of Oregon, as among the victims.
A fourth employee is also "feared to have lost his life in the attack," but BP did not release information on his identity.
"This is confirmation of devastating news and our hearts go out to the families, friends, colleagues and loved ones of these men," BP chief executive Bob Dudley said in a statement.
John, a member of the company's graduate development programme, had joined BP only in September and was making his first trip to Algeria.
"Without doubt, Seb was going to succeed," Andy McEwan, a colleague from BP's North Africa region, said in a statement.
"He was definitely one of a kind when it came to work, as a character and as a person."
He is survived by his wife, Nicola, and a young son.
Estrada, a Colombia native, lived in London and had worked for BP since 1995.
A VP with the company's upstream global projects organisation, he had visited the In Amenas gas plant to lend expertise on the company's position in the country.
"Everyone loved Carlos, he was full of energy, passionate about what he did, incredibly smart and liked by everyone he met," BP North Africa President Felipe Posada said in a statement.
He leaves behind his wife, Claudia, and two young daughters.
Rowan, already confirmed by the State Department as a US casualty of the event, had been in the oil and gas industry since 1986 with BP and previously Arco.
He came to In Amenas after an assignment in China and previous work at Algeria's Rhourde El Baguel field.
"He was respected by all of his colleagues for his openness, personal integrity and commitment to the safety of his people," colleague Mark Cobb said, according to a company statement.
"He was a leader that people wanted to follow, leadership which he fostered though his commitment to the development of his staff."