Relatives of the only Australian who was in the Médecins Sans Frontières hospital in the Afghan city of Kunduz when it was bombed by US forces have spoken for the first time about their outrage at the incident.

Australian Kathleen Thomas was lucky to survive the attack, but 22 others did not, including 12 of her MSF friends and colleagues.

She and her family are angry that the Australian Government has done nothing to help since she returned from what she describes as the worst day of her life.

It was almost two weeks ago when US forces led a bombing raid on the MSF hospital she was working in, with 180 staff and patients inside.

The family of the 32-year-old say it is a miracle she survived.

Ms Thomas returned to Australia at the weekend thankful to be alive but very angry.

She posted an emotional account of the attack on her Facebook page, which the ABC has reproduced here with her family's permission:

"The very foundations on which Médecins Sans Frontières' Kunduz Trauma Centre stood were physically and metaphorically destroyed as a shower of heartless, relentless bombs landed with precision on their intended target — our hospital. "As the hospital burnt to the ground, it took with it the lives of many of my friends, colleagues and patients and injured countless others. "These were colleagues who I had worked side by side with continuously since the beginning of the heavy fighting in Kunduz. "As the war raged around us, we huddled together, taking comfort in the fact that both warring parties respected our hospital's neutrality and impartiality, understood our rules, which aligned with those of international humanitarian law, and knew our GPS coordinates. "We all believed the hospital was the safest place to be. "The events that unfolded that early morning can only be described as a nightmare. "The staff that had tireless looked after victims of war trauma for the past six days had now sustained the same injuries as their patients — limbs blown off, shrapnel rocketed through their bodies, burns, pressure wave injuries of the eyes and ears. "Our colleagues didn't die peacefully like in the movies. They died painfully, slowly, some of them screaming out for help that never came, many alone and terrified knowing the extent of their own injuries and aware of their impending death. "Trapped, fully conscious patients were engulfed in flames and burned to death in their beds. "Those that didn't die sustained major injuries which will render them severely disabled for the rest of their lives. "Kunduz city has lost its only functional health care facility, leaving wounded civilians with nowhere to get medical treatment. "I simply cannot comprehend how or why this happened. But I do know that it is completely inexcusable. "The US military cannot show such utter disregard for international humanitarian law and get away with it. There must be accountability for this brutal event."

Family appalled Australian Government has failed to act

Ms Thomas' mother Gail fought back tears as she spoke of what her daughter had been through.

"It's been very difficult," she said.

"I think she was severely traumatised, so not speaking to anyone for several days other than her colleagues, and then eventually she started to have brief conversations with her partner and he would relay it to us, and I think she was quite clinical.

"Normally she's very emotional and she seemed quite clinical and ... sorry," she said, unable to continue.

Gail Thomas also said she was appalled that the Australian Government had not checked on her daughter despite knowing that she had returned to Australia.

"To me that is beyond belief," she said.

"I think it's just absolutely imperative that the Australian Government, as an ally, puts pressure on the US government to accept an independent investigation, because it's just been ignored."

Kathleen Thomas' sister Julia also backed that call, and said that the lack of support had been appalling.

"They're working at a hospital, so they were on neutral ground," she said.

"They were helping the locals, they were helping everybody, they weren't taking sides. So it should have been safe.

"I mean, the US can't get away with just bombing that entire hospital. They need to be exposed, to explain that."

Sorry, this video has expired Photojournalist discusses images of bodies in bombed hospital in Afghanistan

Julia Thomas said her sister was very angry, but focused on ensuring that such a heart-wrenching atrocity would never happen again.

"I think it's a good thing that she's very angry, and I think she's focussing all her energy on trying to make people aware of what happened and get justice for the people that she left behind," she said.

MSF Australia executive director Paul McPhun confirmed that an International Humanitarian Fact-Finding Commission into the tragedy had been activated.

Mr McPhun has called on the Australian Government to do more to pressure both the US and Afghan governments to cooperate.

"We have communicated that essentially to the Minister for Foreign Affairs here in Australia and in New Zealand and we are awaiting a response ourselves, so it still remains unclear what position that they might take in this case."