A Kabul official says an Afghan guard has turned his gun on colleagues, killing a Nepalese guard and wounding another at a construction site near a U.N. compound in Kabul.

Hassib Sediqi says the shooter also wounded another Nepalese colleague.

Sediqi, acting spokesman for the National Directorate of Security as Afghanistan's intelligence agency isknown, says it's unclear if Friday's attack was planned or the result of a disagreement.

He says a third Nepalese guard was injured when he jumped off the building that was under construction and where the incident happened.

The site is next to the International Organization for Migration and opposite the U.N. Assistance Mission for Afghanistan. Many international agencies and embassies employ Nepalese security guards.