An Azeri man has been arrested after footage of him allegedly raping a teenager who abused his son was discovered.

Police in Azerbaijan's capital Baku were investigating the distribution of child pornography when they were alerted to what appears to be a strange case of vigilantism.

According to news website aysor.am a 17-year-old teenager is accused of luring the man's 8-year-old boy into a van, before assaulting and raping him. It is reported that a passerby witnessed the incident then also attacked the boy - threatening to tell everyone about the "shameful acts”.

The child's father, along with a group of relatives, allegedly tracked down the first rapist and 'revenge-raped' him – while filming the attack on a mobile phone.

The camera phone footage was then distributed in Baku before being found by police.

Both men are now in custody.

Belfast Telegraph