Abdul Rahum Ayubi, who is a lawmaker from Kandahar province where the tragedy occurred, said Monday it seemed impossible for one soldier to cover the ground between the houses that were attacked — over a mile (2 kilometers) — and also burn the dead bodies.

Bismullah Afghanmal, a parliament member, said the reports he received from villagers indicate the shooting before dawn Sunday came from several directions.

But Gen. Mohammed Zahir Azimi, defense ministry spokesman, said initial reports indicate a single shooter.

US officials also said they believe the soldier acted alone.