At least six Afghan nationals were killed and 20 others injured on Sunday in deadly suicide blasts followed by a gun battle between Afghan security forces and militants in Jalalabad area of Afghanistan.
After several hours of fighting that sent plumes of smoke rising into the sky above the accounts office, Attahullah Khogyani, a spokesman for the provincial governor, said that Sunday's clash had ended with all the gunmen killed.
"I then saw at least two armed attackers entering the building".
The Taliban have seized control of districts across the country, and the two groups have carried out attacks in the Afghan capital, Kabul, in recent months that killed scores of people.
The assault came days after suicide bombers and gunmen launched apparently coordinated attacks on two Kabul police stations Wednesday, killing at least ten people.More news: Nawaz Sharif's 26/11 remarks create stir in Pakistan
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No individual or group including the Taliban militants has so far claimed responsibility behind the attack. Both the Taliban and a local Islamic State affiliate have carried out numerous attacks in Nangarhar.
Escalating militant attacks in Afghanistan have left 763 people dead and injured 1,495 others between January and March of this year, according to the quarterly United Nations civilian casualty report released in April. Officials are concerned that a low voter turnout will undermine the credibility of the poll.
Mr Qaderi's account of the attack also varied from Khugyani's.
Kabul has become one of the deadliest places in the country for civilians as security forces struggle to keep the militants at bay following the withdrawal of North Atlantic Treaty Organisation combat forces at the end of 2014.