According to governor's spokesperson Attaullah Khogyani, the explosion occurred hours after Afghan President Ashraf Ghani had visited the city of Jalalabad.

Four people have been killed and ten got injuries as a powerful blast hit the center of Afghanistan's city of Jalalabad, the TV broadcaster reported.

As a result of the explosion several buildings around Mukhaberat square were damaged, the spokesman said.

No group has immediately claimed responsibility for the attack.

Afghanistan is in a state of political and social turmoil, with government forces fighting the continuing Taliban insurgency and other radical group acting in the country.