Local officials said the attack happened after two police were killed at a roadside checkpoint outside the city.
Taliban and US negotiators are scrambling to finalize a draft agreement that will outline the withdrawal of American and NATO troops from Afghanistan and a verifiable Taliban guarantee to fight
President Ashraf Ghani hopes to showcase unity at the four-day meeting — known as Loya Jirga — that brings together politicians, tribal elders and others.
Police flooded the city and authorities blocked off key roads around the venue of the so-called "loya jirga" to discuss possible conditions for a peace deal with the Taliban.
Taliban fighters have stormed several security posts providing protection to Afghanistan’s historic minaret of Jam, cutting access to the Unesco World Heritage Site and killing 18 security forces, officials said on Wednesday.
Hopes for a breakthrough in a push to end Afghanistan’s gruelling conflict suffered a major setback on Friday after a key summit between the Taliban and Afghan officials was indefinitely postponed.
The US special peace envoy for Afghanistan should stop calling on Taliban militants to lay down their arms and convince the United States to end the use of force instead, the Taliban said on Friday.
Two children and eight security forces were among the casualties, said Ataullah Khogyani, spokesman for the Nangarhar provincial government.
At least eight security personnel and six civilians were killed and over 180 people sustained injuries when Taliban attacked a government security compound on Sunday, officials said, as rival Afghan groups met in Qatar to hold talks on peace process.