Attackers on Wednesday entered the International Non-Governmental Organization (INGO) Save the Children office in Afghanistan's Jalalabad city of Nangarhar province after a car bomb exploded outside.
A clash between insurgents and security force members is underway.
Before the attackers stormed the office, a suicide bomber detonated a car at the gate.
Eleven people have been wounded, Afghan officials have confirmed.
According to a spokesperson for the provincial governor, Attaullah Khoghyani, clashes between insurgents and security force members were underway.
The attack comes just three days after Taliban gunmen raided a luxury hotel in Kabul, killing at least 22 people, mostly foreigners.
Further details are awaited.
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