An Afghan girl believed to be about 10 years old was caught in Helmand province wearing a bomb vest after her brother encouraged her to carry out a suicide attack, police officials said.
The girl, named as Spogmai, had been convinced to attack border police after male relatives accused her of having "illicit relations" with officers, according to reports.
She was strapped into a bomb harness by one of her elder brothers and sent across a river to her target, in southern Helmand.
However Spogmai began crying with cold while crossing the river and her brother, a suspected Taliban commander called Zahir, fled according to the Pahjwok news agency.
Some reports said she was still wearing the vest when she handed herself in to the police and others said Zahir took it with him.