Khost, a restive Afghan province bordering Pakistan, is home to members of the Taliban and also Al Qaeda militants, officials say. No group has so far claimed responsibility for the attack.
The suicide attack happened late afternoon at the centre, which offers training and courses for students in higher education in a western district of Kabul.
Officials are blaming the Taliban for the attack, which killed at least nine civilians, including three women.
The attacks were the deadliest since the August 18 military coup that overthrew President Ibrahim Boubacar Keita, and came just days after scores of jailed militants were freed by the interim government in a prisoner swap.
At least 9 people have died in an attack targeting the military in Helmand province.
A US official says the Trump administration’s warning was given to both Iraq’s president and the prime minister but that it is not an imminent ultimatum.
Nigerian security sources confirm that the attack by suspected militants on the security convoy killed policemen, soldiers, government-backed militia members and civilians.
One group staged an attack near a Turkish observation post but no damage to was reported, Turkey's Defence Ministry said.
The aid agency says its vehicle, which was clearly marked with the Red Crescent emblem, was attacked by people wearing masks and camouflage fatigues in Al Bab.
Afghanistan Vice President Amrullah Saleh was on his way to work on when the attack on his convoy took place.
No one claimed responsibility for the attack which was carried out with an explosives-laden motorcycle, killing at least five people and wounding 10 others.
A total of eight people were killed, including six French nationals, in the attack near the town of Koure, which is an hour's drive from the capital Niamey.
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