Kabul, Afghanistan (CNN) -- A suicide bomber detonated a car bomb near a bank in southwest Afghanistan on Saturday, killing four people, a governor's spokesman said.
Twenty-one others were injured in the attack in Helmand province, including 10 Afghan soldiers and five police officers.
The attack was carried out in a Toyota Corolla, said Dawood Ahmadi, the spokesman for the Helmand governor.
In another attack Saturday, 19 people were injured when a suicide bomber targeted a police post in Kandahar, authorities said.