President Ashraf Ghani and the Taliban have both indicated that long-delayed negotiations could begin straight after Eid.
Under the US-Taliban peace deal that was signed in Doha, the Afghan government would release 5,000 Taliban members, of which it has so far freed more than 4,400.
The incident happened last week when insurgents stormed the home of Qamar Gul, a teenager from a village in the central province of Ghor.
As head of a newly united military wing, 30-year-old Mullah Mohammad Yaqoob brings his father's fiercely uncompromising reputation to the battlefield.
Zalmay Khalilzad was wrapping up a week-long trip that included stops in Uzbekistan, Pakistan and the Gulf state of Qatar, where Taliban negotiators are headquartered.
The crisis over decision-making comes at a critical time for Afghanistan, as the United States is drawing down its troops in accordance with a bilateral deal struck with the Taliban in February.
The Army spokesperson said that the explosives were placed in a Mazda truck that was detonated in front of the gate of the facility at around 8:30 am.
The statement from the Afghan Defense Ministry said the troops pushed back the attackers, adding that the Taliban also suffered casualties but without providing specific figures.
In a statement late Saturday by the US Embassy in Kabul, Khalilzad also sought Pakistan's help in locating Frierchs.
The Taliban said that the Afghan government's calling for a ceasefire was "not rational and convincing" while the peace process is being impeded by the Afghan government
The stalled prisoner swap has been beset with problems and peace talks seem as elusive ever amid ongoing attacks.
Twelve militants were killed in the Badghis province following their attempt to attack a security post.
The two foes have been holding talks in Kabul since last week to try to finalise the prisoner swap that was originally supposed to have happened by March 10.
Taliban political spokesman Suhail Shaheen told AFP that '5,000 prisoners should be released as a trust-building measure, and that this should be before the intra-Afghan talks'.
The agreement, which will initially see 100 prisoners freed each day, will depend on the Taliban's willingness to significantly limit attacks in the country.