At least 20 civilians were killed and 90 others wounded in a car bombing in Zabul province early on Thursday, provincial governor spokesman Gul Islam Sayal said.
The car bomb was detonated at around 5:30 am in Qalat city, the capital of Zabul province in south of Afghanistan.
According to Mr. Sayal, a suicide bomber detonated an explosive-laden car near a hospital and provincial directorate of the Afghan intelligence agency in Qalat.
The number of casualties may rise as rescue teams and people are still searching the bodies under the ruble, an official said.
The Taliban insurgent group claimed responsibility of the attack.