The attack came two days after President Ashraf Ghani offered to hold peace talks with the Taliban.
President Donald Trump has raised the US military presence in Afghanistan from 11,000 to 15,000 troops at the urging of Pentagon officials who argue the increased firepower will force the insurgents to come to the negotiating table.
The offer, made at the start of an global conference aimed at creating a platform for peace talks, adds to a series of signals from both the Western-backed government and the Taliban suggesting a greater willingness to consider dialogue. It contains a list of offers and agreements that meet the Taliban's key demands over the years.
Some of the incentives listed by Ghani in return for a cease-fire include an official Taliban office in the capital and Afghan passports for the group's members.
"China is willing to provide assistance to the Afghan reconciliation and peaceful reconstruction process as our capacity allows", Hua Chunying said during her regular briefing.
"The Taliban has to abandon terror, it has to abandon violence and it has to support the Afghan constitution".
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He added that the militants have suffered heavy casualties under the new US strategy of increased airstrikes and commando raids.
US has said repeatedly that Pakistan isn't doing much to take action against terror groups acting on its soil. "They derive their power from their ability to keep fighting", he said.
The first Kabul Process conference was first held in June past year. The fighting continued elsewhere in the country on Wednesday.
On Thursday, Taliban fighters killed at least six policemen in an attack at a checkpoint in southern Afghanistan, officials said.
In regards to the government's efforts for the reconciliation process, President Ghani said he has shared his proposals for the peace talks during the Kabul Process II summit. Dost Mohammad Nayeb, spokesman for governor of Uruzgan, confirmed the incident.
"The attack again highlights the threat posed by terrorist and insurgent groups to the people of Afghanistan".