There have been several attacks in Afghanistan in the past few weeks against the USA security forces and the Afghan forces. Recent weeks have brought frequent attacks on police and US security forces in Afghanistan, even as the United States and Taliban Islamist militants pursue talks to finalize a peace pact.
The Taliban has not attacked any major regions or cities in recent times to maintain the talks with the US. Trump administration is trying to withdraw from the region after almost 18 years of war in the country.
Other projects included counter-narcotics, governance, and mine removal.
A total of six US service members have been killed in Afghanistan since the start of the year. Road construction accounted "for 30% of all casualties", the agency said. The report didn't say how many among the kidnapped had been recovered.
About $137 billion has been spent on Afghan reconstruction and aid since 2002. Today that figure has risen to 55 percent of Afghans.
The same university was attacked by a suicide bomber in late May past year, and Islamic State (IS) militants claimed responsibility for the bombing.
The United Nations has blamed the increased US bombing, at least in part, for a rise in civilian casualties in Afghanistan.
On Tuesday, Afghanistan's interior ministry said a suicide bomber killed six people near a military academy in Kabul, the Afghan capital.
Earlier in the day, an eyewitness said that "The blast occurred outside Marshal Fahim National Defense University when military cadets and university staff were arriving and waiting to enter the compound".
According to the reports, it is said that after nearly three months of peace, no one has taken responsibility for this terrorist incident in the capital of Afghanistan.
Anne Ball wrote this story with information from the Associated Press, Reuters and RFE/RL.
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The State Department declined to comment on negotiations beyond saying, "U.S. talks with the Taliban in Doha continue around the specifics of a reduction in violence".