Donald Trump has publicly called off US peace talks with Afghanistan after claiming he was due to hold a “secret” meeting with Taliban leaders at Camp David.

Writing on Twitter, Mr Trump said he had been due to meet both members of the militant Islamist group and the president of Afghanistan at the presidential retreat in Maryland on Sunday.

However, he announced he had decided to call off the negotiations after the Taliban claimed credit for a car bomb in Kabul earlier this week, which left 12 dead, including one US soldier.

“Unbeknownst to almost everyone, the major Taliban leaders and, separately, the President of Afghanistan, were going to secretly meet with me at Camp David on Sunday,” Mr Trump wrote.

“They were coming to the United States tonight. Unfortunately, in order to build false leverage, they admitted to an attack in Kabul that killed one of our great great soldiers, and 11 other people.

Afghanistan war: lives of children devastated by the endless conflict Show all 20 1 /20 Afghanistan war: lives of children devastated by the endless conflict Afghanistan war: lives of children devastated by the endless conflict Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Nooria*, 15 in the home her family has lived in for the past two years in Mazar-i Sharif She was forced to flee her home with her family after their town was attacked by armed groups. Nooria describes a rocket hitting her neighbours home killing many inside. They fled on foot with just the clothes on their backs and she now lives in Mazari Shariff where Save the Children have enrolled her in school and provide vocational training Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Nooria* hopes for a future with no war; "When they attacked our village, the rocket hit our neighbour's house and they all died. Our house then caught fire and we ran away. My friends who I used to play with - I still don't know if they are alive or if they are dead.” Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict “I'm hoping for a better future, to learn, to support my family and to get them out of this difficult life. And I'm hoping for a future where there is no war.” Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Naveed*, 16 at his family home in Mazar-i Sharif Naveed lost his leg when he stepped on a mine aged just 8-years-old. He was herding the family's sheep in the mountains near their home when he triggered a landmine Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict After months of medical treatment his right leg was eventually amputated. He received physiotherapy and a prosthetic leg from the International Committee for the Red Cross in Mazar Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Now enrolled in school, Naveed is being given vocational training by Save the Children. “For around a year I felt and dreamt that I still had my leg. But when I woke up and saw, there was no leg. Sometimes I’d feel with my hand to check and find it wasn't there.” Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict “If someone has loses their leg, it does not mean that they have lost their mind." Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict "With the help of our minds we can continue to study, learn, and work to make the future of our families brighter.” Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Naveed and Mahboob*, 55 (Naveed's father) Several years ago Neveed's father, Mahboob, was brutally beaten with rifle butts by armed groups after, he says, he failed to provide food for them while they were stationed in the family's village. He suffered brain damage which affected the right side of his body, speech and his brain function Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Habiba*, 14, and Arezo*, 15 in a village outside Kabul Habiba and Arezo were injured with their mother three years ago in a suicide bombing in Kabul. Arezo is still traumatised from what she saw and has become completely withdrawn Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Arezo's younger sister Habiba cares for her, takes her to lessons and anywhere she wants to go. They are both in school through Save the Children's 'Steps towards Afghan girls' education success' (STAGES) programme, which helps the most marginalised girls get access to education, stay in school and learn. Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Habiba says: “When I woke up and I opened my eyes I saw lots of bodies and I thought I was not alive any more. It was horrible. I'll never forget that. Whenever there is a big sound she gets scared because she was traumatised by the sound she heard during the attack. I love my sister, and I help her with her lessons, I take her anywhere." Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict "She's older than me but I feel like the older one because I support her. I hope for a better future for me and my sister.” Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Khalida*, 10 in a classroom in a village outside Kabul Two years ago Khalida lost her 18-year old brother when he was killed in an explosion in Kabul. She misses him every day and says the family are still carrying the grief of his loss Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict "Two years ago, my brother was going to Kabul when an explosion happened and he lost his life. We are still carrying the grief and are crying over him. At the time we were happy, everyone was happy. Now no-one is happy in the family. When I remember him, I cry and feel so bad. I hope for peace and that war will stop, and that nobody loses their brother” Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict “I want to get education to become a teacher. I want to teach others who have never been to school” Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Sema*,11 at her family home in Kabul Sema recalls coming home from her aunt's house and being told that her father had been killed in a suicide attack Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict Sema still thinks about him every second and likes to look at his prayer beads (Tisbeh) to remember him. They hang from the curtain in the family home. She loves school and wants to become a teacher one day. Sema says she wants peace in her country to stop other children losing their fathers. “We still have lots of his belongings, like his car, his clothes, his watch, his shoes. Whenever we see them we cry. He gave us all so much love every moment and he is on our minds. I want for the powerful people around the world to stop the war and bring peace, because I don't want other children to lose their fathers.” Andrew Quilty/Save the Children Afghanistan war: lives of children devastated by the endless conflict “I want to become a teacher to serve the country and I don't want any girls to be illiterate. I want to teach all the girls, so they have access to education.” *Names have been changed to protect identities Andrew Quilty/Save the Children

“I immediately cancelled the meeting and called off peace negotiations. What kind of people would kill so many in order to seemingly strengthen their bargaining position?”

The president added: “If they cannot agree to a ceasefire during these very important peace talks, and would even kill 12 innocent people, then they probably don’t have the power to negotiate a meaningful agreement anyway. How many more decades are they willing to fight?”

Mr Trump’s decision to pull out of talks came just days after the US’s top negotiator for peace in Afghanistan, Zalmay Khalilzad, said the two sides were close to a deal to end America’s longest war..

A draft framework agreement had been drawn up under which US troops would leave five military bases in Afghanistan within 135 days of the signing of the pact.

In return, the Taliban would be expected to guarantee the country will not be used as a launchpad for global terrorist operations.

However, the Taliban has carried out several deadly attacks across Afghanistan in recent weeks while talks with US envoys have been ongoing.

The attacks are seen as strengthening the negotiating position of the Taliban, who control or hold sway over roughly half of Afghanistan and are at their strongest since their 2001 defeat by a US-led invasion.