Kabul: A large blast rocked Kabul on Thursday evening, followed by gunfire in the Afghan capital`s central district that houses many embassies and foreign compounds, AFP journalists reported.
Earlier in the day, a suicide bomber rammed his explosives-packed car into a British embassy vehicle in Kabul, killing one Briton and five Afghans in the latest attack to highlight fragile security as NATO troops withdraw.
Police were unable to give immediate details on the latest attack, which appeared to be ongoing as sporadic gunfire erupted.
Attacks across Kabul have increased in recent weeks as US-led NATO forces prepare to wrap up their 13-year combat mission against the Taliban at the end of this year.
At least eight blasts have hit Kabul over the last 10 days, including attacks on foreign compounds and on a female Afghan member of parliament who was injured in a suicide bombing that targeted her car.
Fears are growing that Afghanistan could tip into a cycle of violence as the NATO military presence declines, with the national security forces already suffering high battlefield casualties.
Afghanistan suffered its deadliest attack of 2014 on Sunday when a suicide bomber struck at a volleyball match in the eastern province of Paktika, killing 57 people.
About 12,500 foreign troops are set to stay on into 2015 after the NATO combat mission ends, to train and support the Afghan army and police.