A BBC film crew investigating a string of child killings in the southern African state of Malawi narrowly escaped death, after an undercover meeting with a witch-doctor was interrupted by a mob accusing them of being “vampires”.

The documentary team from BBC Africa were working alongside undercover journalist Anas Aremeyaw Anas, who never shows his face, to investigate a string of murders which have been attributed to black-magic “muti” witch-doctors.