It came just hours after President Ashraf Ghani announced plans to form a team to seek a peace deal with the Taliban.
At least 10 people were killed and 19 were wounded in an attack on a compound of British security group G4S in the Afghan capital Kabul today.
Interior Ministry deputy spokesman Nasrat Rahimi said casualties were "not known".
In June of 2017, the Taliban claimed an attack where an Afghan soldier shot and killed three US soldiers in the Achin district of the eastern Nangarhar province.
He added a suicide bomber detonated his explosives and then other insurgents started a gun battle with forces in the area.
Following the explosion, which could be heard throughout the city, security guards and Afghan security forces engaged the attackers, according to Kabul Police Chief Basir Mujahid.
Three US service members killed in Afghanistan blast
The violence comes as the Taliban intensifies pressure on Afghan security forces, even as the worldwide community ramps up efforts towards talks. Jasso was wounded by small-arms fire and was treated and evacuated to the nearest medical treatment facility, where he died, NATO's Resolute Support mission said Tuesday.
"There are no indications he was shot intentionally", the mission said in a statement. He couldn't provide any other details on the company.
A auto bomb exploded near to a security contractors' compound in the Afghan capital Kabul on Wednesday, sending a thick plume of smoke into the night sky and officials reported gunfire in the wake of the blast.
Attahullah Afghan, who heads the provincial council, said most of the casualties in Helmand, which included men, women and children, happened in an airstrike that hit a house on Tuesday night during military operations in the province, a Taliban heartland.
"We can confirm that there has been an incident at one of our locations in Kabul", a G4S spokesperson told news agency AFP.
The Taliban has claimed responsibility for the attack. There was also a auto packed with explosives that ignited during the strike, the statement added.
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