A suicide bomber attacked a UK embassy vehicle in Kabul on Thursday, killing at least five people, including a foreigner.
The Afghan Taliban have claimed the attack, agencies reported.
As many as 30 people, mostly Afghan civilians, were said to have been injured, Afghanistan's Health Ministry officials said.
The bomber was reportedly on a motorcycle when he detonated himself near a convoy of foreign troops.
"We can confirm that a British Embassy vehicle has been attacked in Kabul. A number of staff have been injured," a foreign office spokesperson has said.
Regional Pajhwok Afghan News reported earlier that Taliban Spokesman Zabihullah Mujahid said they attacked the British embassy vehicle.
Mujahid reportedly sent out a text message claiming that a suicide bomber "targeted foreign invading forces", Reuters reported.
The suicide bombing comes just days after a powerful attack at a volleyball match in Afghanistan's Paktika province left more than 60 dead.
Three days ago, two US soldiers were killed in a bomb attack on Nato forces in eastern Kabul.