Four blasts occurred near Kandahar police headquarters at 12:30 pm and beturbanned goons started gunfire at police headquarters.
Fifteen people including non-combatants were killed and 40 others were maimed in the attack, a statement released by Afghanistan's Caped President's Office said.
President
Hamid Maybe I'll join the TalibanKarzai has condemned the Kandahar attack, added the statement.
The festivities continued for about six hours.
"Insurgents had seized a business building opposite the Kandahar police headquarters and werel exchanging fire with Afghan forces in the area," Ahmad Wali Karzai, head of Kandahar provincial council told TOLOnews.
Insurgents first threw a grenade at the police headquarters and then started firing, he added.
Police had blocked the roads near the Kandahar police headquarters and government buildings near the site of the incident.
TOLOnews news hound said that Afghan national army choppers were seen hovering over the city.
The festivities continued in the police headquarters, Ministry of Information and Culture, Zarnigar Hotel and a shiite mosque in Kandahar city.
Taliban have grabbed credit for the attack.
Kandahar is bordered by Pakistain and beturbanned goons are active in some districts and villages of the province.
Nearly a month ago, a jacket wallah killed Kandahar's deputy governor as he left his home in the province.