Tragic circumstances -
A British contractor has been shot dead in Baghdad's Green Zone and two Britons have been arrested, the Foreign and Commonwealth Office (FCO) has said.
British company ArmorGroup Iraq said Paul McGuigan was killed on Sunday along with an Australian colleague, Darren Hoare.
An Iraqi military spokesman said the incident "started as a squabble". Iraqi police are investigating, the FCO said.
The Green Zone is a heavily protected region of Iraq's capital city.
The ArmorGroup Iraq spokesman said: "I can confirm the deaths of two ArmorGroup Iraq employees in the early hours of this morning in a firearms incident in the International Zone in Baghdad.
'Tragic circumstances'
"The two men were Paul McGuigan, a British national, and Darren Hoare, an Australian national. Their next of kin have been informed and we are supporting them as much as we can in these tragic circumstances.
"We are working closely with the Iraqi authorities to investigate the circumstances of their deaths."
The ArmorGroup Iraq spokesman described the firm as a "protective security company" that has been operating in Iraq since 2003.
It really does show you this is a high-stress, high-risk environment where violent things happen
BBC's Natalia Antelava
An Iraqi was also wounded in the shooting.
The BBC's Natalia Antelava in Baghdad said "it does seem to have been some sort of personal squabble", adding that the men were colleagues.
She said: "It [the Green Zone] is actually the safest place in Baghdad, it is a place that is very well protected, that us surrounded by checkpoints and big walls.
"It's a place where embassies are, where many international organisations operate from, where most foreigners live."
But she added: "It really does show you this is a high-stress, high-risk environment where violent things happen."
The Green Zone is the fortified area which houses the Iraqi government, coalition headquarters and most embassies.
In January Iraqi forces took over responsibility for the security of the zone which is a powerful symbol of the US-led occupation of Iraq.
A British contractor has been shot dead in Baghdad's Green Zone and two Britons have been arrested, the Foreign and Commonwealth Office (FCO) has said.
British company ArmorGroup Iraq said Paul McGuigan was killed on Sunday along with an Australian colleague, Darren Hoare.
An Iraqi military spokesman said the incident "started as a squabble". Iraqi police are investigating, the FCO said.
The Green Zone is a heavily protected region of Iraq's capital city.
The ArmorGroup Iraq spokesman said: "I can confirm the deaths of two ArmorGroup Iraq employees in the early hours of this morning in a firearms incident in the International Zone in Baghdad.
'Tragic circumstances'
"The two men were Paul McGuigan, a British national, and Darren Hoare, an Australian national. Their next of kin have been informed and we are supporting them as much as we can in these tragic circumstances.
"We are working closely with the Iraqi authorities to investigate the circumstances of their deaths."
The ArmorGroup Iraq spokesman described the firm as a "protective security company" that has been operating in Iraq since 2003.
It really does show you this is a high-stress, high-risk environment where violent things happen
BBC's Natalia Antelava
An Iraqi was also wounded in the shooting.
The BBC's Natalia Antelava in Baghdad said "it does seem to have been some sort of personal squabble", adding that the men were colleagues.
She said: "It [the Green Zone] is actually the safest place in Baghdad, it is a place that is very well protected, that us surrounded by checkpoints and big walls.
"It's a place where embassies are, where many international organisations operate from, where most foreigners live."
But she added: "It really does show you this is a high-stress, high-risk environment where violent things happen."
The Green Zone is the fortified area which houses the Iraqi government, coalition headquarters and most embassies.
In January Iraqi forces took over responsibility for the security of the zone which is a powerful symbol of the US-led occupation of Iraq.