'Investigation ongoing' into US soldier motive

A US soldier in Afghanistan has killed 10 civilians and wounded five in Kandahar province after suffering a breakdown, officials say.

He left his military base in the early hours of the morning and opened fire after entering local homes, the BBC's Quentin Sommerville reports from Kabul.

Nato has called the incident "deeply regrettable incident".

General Carsten Jacobson, who's spokesman for Nato-led forces in Afghanistan, told the BBC the soldier left his base "in the middle of the night", however his motivation was as yet unknown.