A senior security official said the blast happened close to a compound of British security contractor group G4S, near an industrial park on the main road leading out of Kabul towards eastern Afghanistan. Attack helicopters flew in to support the evacuation of the wounded.
A statement from the governor's office in Helmand confirmed that 16 Taliban insurgents were killed and said that an investigation was under way to determine the number of civilian casualties. The Taliban claimed that attack. However, Kabul police spokesperson Basir Mujahid refuted reports of gunfire.
Gunmen have attacked a British security contractors' compound in Kabul, killing at least 10 people and wounding 19 hours after the Afghan president, Ashraf Ghani, outlined plans for peace in the country. "It gives you an idea just how much of a load of this fight is being carried by the Afghan army", he said.
"There are no indications he was shot intentionally", the statement added, naming the soldier as Sgt Jasso without giving a first name. He couldn't provide any other details on the company.
"A number of gunmen entered the G4S compound right after the auto bomb", said Najib Danish, an Interior Ministry spokesman.
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Danish says there are casualties but the number of dead and wounded was not immediately clear.
The building - in the Afghan capital Kabul - was attacked by militants today.
The Taliban rampaged through the districts, targeting members of the local Hazara militia and burning thousands of homes, before Afghan forces launched a belated counterattack. On Tuesday, US officials said they had determined that Jasso probably was accidentally shot by an Afghan soldier during battle with an Al-Qaeda fighter.
The meeting aims to take stock of progress of the Afghan government in using billions of dollars in foreign aid for education, health care, humanitarian support and needs since 2016.
"We can confirm that there has been an incident at one of our locations in Kabul", a G4S spokesperson told news agency AFP. There was also a auto packed with explosives that ignited during the strike, the statement added.