(Updates 6/15 story with new info grafs 1-2))

A roadside bomb has killed four people in southern Afghanistan.

Provincial officials say the bomb detonated when a tractor ran over it in Maruf district, Kandahar province. The Associated Press reports the victims were three women and one man.

On Wednesday, suicide bombers killed at least 10 people in Afghanistan, while Afghan leaders escaped a rocket attack not far from the country's capital.

In the deadliest attack Wednesday, a car bomber killed seven people near government buildings and the provincial governor's office in Kapisa province. The Taliban claimed responsibility for the attack.

A separate suicide bombing killed at least three people at a government office in the Sayed Karam district of eastern Paktia province, which borders Pakistan.

And Afghan officials say the country's vice president and interior minister were unharmed after rockets hit a police training center they were visiting in Wardak province. No one was injured in the attack.

In southern Afghanistan, Afghan officials say troops killed 14 insurgents in Kandahar province. The governor's office said nine militants were killed after crossing the Pakistani border, while five were killed while trying to plant roadside bombs.