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The attack came hours after a double bombing in front of a girls' school in the provincial capital of Jalalabad killed a boy and wounded four others.
NATO formally concluded its combat mission in Afghanistan in 2014, but some 16,000 U.S. and other NATO soldiers are providing support and training to Afghan troops .
At least 67 people, including students and teachers, were inside the centre in Jalalabad, the capital of Nangarhar province, at the time of the attack.
As per the report, the blast took place at an Eid gathering here between Taliban and the Afghan government.
The attack was the latest in a wave of relentless violence in Kabul this month unleashed by the Taliban and the rival Islamic State group that has killed scores and left hundreds wounded.
After blowing up a car outside the British charity's compound in Jalalabad city, the attackers used a rocket-propelled grenade to storm the complex.
The attack ended yesterday with all six militants killed by Afghan forces, aided by Norwegian troops.