ISIS offers $50,000 reward for head of Bulgaria's 'migrant hunter': Vigilante who terrorises refugees along the Turkish border for 'sport' finds himself being targeted by jihadis
- Dinko Valev's units use military vehicles and dogs to hunt asylum seekers
- He hands illegal migrants over to the police 'because they are all jihadists'
- Wants Bulgarian state to fund operation and pay for every captured refugee
- Human rights group accuse Valev of terrorising migrants with death threats