Officials say a suicide bomber riding a motorcycle has struck a British Embassy vehicle in the Afghan capital, Kabul, killing one British citizen and at least five Afghans.
More than 30 people, including five children, were injured in the blast, the Interior Ministry said.
The U.K. Foreign Office has confirmed that one British national was among those killed in the attack.
"I am deeply saddened to confirm that a British national civilian security team member and an Afghan national working for the embassy were killed in the incident," Foreign Secretary Philip Hammond said in a statement, adding that another Briton had been injured.
Police officials said the incident took place in the eastern part of the city on the Kabul–Jalalabad highway.
Eyewitnesses said the powerful blast shook parts of Kabul and sent a huge plume of dust and smoke into the air.
The blast, reportedly, shredded the four-wheel-drive embassy vehicle, leaving a charred shell lying on its side.
The Taliban claimed responsibility for the attack, saying the suicide bomber "targeted foreign invading forces."
The area of the blast has many foreign compounds and international military installations.
WATCH: Video from the scene of the blast
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At Least Six Killed As Afghan Blast Hits UK Embassy Vehicle
In recent weeks, insurgents have launched attacks on military convoys in the area and on compounds housing foreign service companies and their international employees.
On November 24, two NATO soldiers were killed and a civilian wounded in a bomb attack in that area.
Kabul has come under almost daily attack as insurgents intensify their war on local security forces and U.S. and NATO troops, who are set to officially conclude their combat role in the country at the end of December.
Britain this week ended its 13-year military presence in southern Afghanistan when the last Royal Air Force personnel departed Kandahar airfield.