(Adds U.S. examples of Taliban using white phosphorus)
By Emma Graham-Harrison
BAGRAM, Afghanistan, May 8 (Reuters) - Life as 8-year-old Razia knew it ended one March morning when a shell her father says was fired by Western troops exploded into their house, enveloping her head and neck in a blazing chemical.
Now she spends her days in a U.S. hospital bed at the Bagram airbase, her small fingernails still covered with flaking red polish but her face an almost unrecognisable mess of burned tissue and half her scalp a bald scar.
"The kids called out to me that I was burning but the explosion was so strong that for a moment I was deaf and couldn’t hear anything," her father, Aziz Rahman, told Reuters.
"And then my wife screamed ‘the kids are burning’ and she was also burning," he said, his face clouding at the memory.
The flames that consumed his family were fed by a chemical called white phosphorous, which U.S. medical staff at Bagram said they found on Razia’s face and neck.
It bursts into fierce fire on contact with the air and can stick to and even penetrate flesh as it burns.
White phosphorus can be used legally in war to provide light, create smokescreens or burn buildings, so it is not banned under international treaties that forbid using chemicals as weapons.
Colonel Gregory Julian, a spokesman for the commander of U.S. and NATO forces in Afghanistan, General David McKiernan, confirmed that Western forces in the country use the chemical.
"In the case of white phosphorus it is used on the battlefield in certain applications...It is used as an incendiary to destroy bunkers and enemy equipment; it’s used for illumination."
But U.S. military training manuals say firing it at people is illegal. Its use in populated areas has been a persistent source of controversy.
Razia and her family are the first known civilian casualties of its use in Afghanistan.
Rahman said the shell that burned his daughter landed after a firefight near their house in the eastern province of Kapisa. The NATO-led international force there is made up mainly of French troops, with U.S. support.
"Troops were on the road, the Taliban were on the mountain and we were at the house, sandwiched between them. When the Taliban began retreating, they fired artillery at them, 12 rounds. One hit my house," Rahman said.
A spokeswoman for the NATO-led force rejected Rahman’s account and said an internal investigation concluded that it was "very unlikely" the weapon that hit Razia’s house was theirs, because of the timing and location.
U.S. Major Jennifer Willis suggested instead that the Taliban had fired the shot, saying they had been observed using white phosphorus in the past:
"An enemy mortar team, known to have been operating in that area, may have been responsible".
After initially declining to provide examples, she later gave details of four incidents over the last 18 months — two in which NATO forces came under fire with ammunition containing white phosphorus and two in which they discovered white phosphorus munitions in the field that had not been fired.
But Marc Garlasco, senior military analyst at Human Rights Watch and a former senior Pentagon intelligence analyst, said those "seem like isolated incidents compared to the widespread and regular use of white phosphorus by US and NATO forces."
"It is possible that the Taliban were firing 120 millimeter white phosphorus mortars if they got into some old Russian stores or were picking up shells and it was one among many," he said.
The use of the chemical for illumination and concealment of troop movements suits foreign forces in a hostile environment, but it is of little use to insurgents who know the terrain and can blend into the civilian population, he said.
"They want high explosive to shock and kill. Flames raining down from the sky aren’t going to frighten the U.S. forces."
Zaher Murad, an Afghan Defence Ministry spokesman, said the government was not aware of insurgents using white phosphorus in any attacks.
The Taliban also denied that they used it.
"This is not true, it is just a mere allegation," spokesman Zabihullah Mujahid said.
When Rahman saw his daughter on fire, he rushed her out to the yard, where he put out the flames with water stored to mix mud for a new wall. Her hair came away in clumps in his hand.
He raced inside to find two other children dead from head wounds, then hoisted Razia on his back and staggered towards the base where soldiers arranged a U.S. airlift that almost certainly saved her life.
Colleen Fitzpatrick, a U.S. military surgeon who has been treating Razia, confirmed she was hit by white phosphorous and had burns to 40 percent of her body.
"The way we treat that is with skin grafts...because her burns were so extensive we had to allow some of those donor sites to heal first, so we would go back to take skin from the same place more than once," Fitzpatrick said.
Razia, who did not want her picture taken, is now suffering mentally as well as physically.
"My daughter is really sad and really lonely and she misses her family and mother. When I call home in the afternoon she talks with her mother and is always saying ‘mum, I miss you’".
Rahman says he is grateful for the medical help she has received from U.S. doctors, and reserves his anger for the provincial governor who visited his daughter but who offered no comfort, saying only "she will never get a husband".
When she leaves the hospital she will face a struggle to rebuild her life. Although doctors say it may be possible to reduce her disfigurement, U.S. help may one day be cut off.
"Its never going to be normal, but there is still certainly room to improve on what she has," Fitzpatrick said.
"We would like to be able to offer her things down the line, but a lot of that just depends on the tempo of the war ... Obviously our primary mission is to support our troops," (Additional reporting by Sayed Salahuddin; Editing by Peter Graff and John Chalmers)