Concerns white phosphorus used in Afghan battle (AP)

KABUL – Doctors voiced concern over "unusual" burns on Afghan villagers wounded in an already controversial U.S.-Taliban battle, and the country's top human rights groups said Sunday it is investigating the possibility white phosphorus was used. The American military denied using the incendiary in the battle in Farah province — which President Hamid Karzai has said killed 125 to 130 civilians — but left open the possibility that Taliban militants did. The U.S. says Taliban fighters have used white phosphorus, a spontaneously flammable material that leaves severe chemical burns on flesh, at least four times the last two years.

Using white phosphorus to illuminate a target or create smoke is considered legitimate under international law, but rights groups say its use over populated areas can indiscriminately burn civilians and constitutes a war crime.