At least 30 people were killed and dozens injured after four suicide bombers struck Saturday in the southern city of Kandahar, the Afghan president's half-brother said.

Ahmed Wali Karzai, a member of the Kandahar provincial council, said a main target of the attacks was a prison, but no prisoners escaped.

In June 2008, a suicide bomber blew apart the Kandahar prison gates and a nearby checkpost. Damage from the blast allowed hundreds of prisoners to escape, many of them suspected insurgents.

Karzai said a second explosion occurred close to the police headquarters, and casualties were reported at a wedding hall nearby.

Police officer Mohammad Nahim said at least four policemen were killed.

The Taliban claimed on a website that members of the militant group carried out the attacks on "enemies of the mujahedeen [holy warriors]."

With files from The Associated Press