Kabul, July 28 (DPA) Fifteen people, among them a presidential campaign worker, were killed in three separate incidents in Afghanistan, officials said Tuesday.

In the eastern province of Laghman, a local election campaign official of presidential candidate Abdullah Abdullah was shot dead Tuesday morning by unidentified gunmen in Dawlat Shah district.

Rahm Khuda Mukhlis, the police chief of Dawlat Shah district, confirmed the attack on officials of Abdullah's election campaign and said that one person was killed and two others were injured in this incident.

Three employees of a private construction company and three civilians were killed in the south-eastern province of Khost.

The vehicle of a private road construction company struck a roadside mine Monday and killed at least three company staff, said Fazal Rabi, a spokesman for the governor of Khost.

'After the incident, security officials of the road construction company opened fire on a gathering of people.