Afghan officials say a car bomb has exploded near a southern bank, killing four people and wounding more than 20 others.

Authorities say 10 soldiers and at least four police were among the wounded Saturday in the blast in Lashkar Gah, the capital of Afghanistan's volatile Helmand province.

Control of security in Lashkar Gah passed from foreign to Afghan forces in July as part of the first wave of a transitional process that is due to see all foreign combat forces leave Afghanistan by the end of 2014.

Later Saturday, Afghan officials say two blasts in the southern city of Kandahar wounded at least 20 people.

No one has claimed responsibility for the attacks.