The knowledge that thousands of Palestinians may be working covertly for Israel's internal security services is leading to paranoia and murder in the West Bank.
Adel Ahmed rarely has visitors to his home in the village of Kfar Deek in the West Bank.
He and his family are shunned by their neighbours.
"We don't have a relationship with anybody in this village," he says bitterly.
Adel and his family are considered to have committed the greatest crime in Palestinian society - collaboration with Israel.
He vigorously denies the charge. But he has paid heavily for his alleged crime, losing his livelihood, his social position and one of his sons.
Over cups of bitter coffee in the shabby and neglected lounge of his house Adel tells his story.
His trouble began, he claims, after his sister was molested by some Palestinian Authority officials.
He then complained to the government only to have the officials turn on him and accuse him of collaborating with the Israelis.
"It destroyed our family, alienated us and destroyed us," he says quietly.
Torture
Adel was arrested by the Palestinian Authority and according to him was tortured. Half his teeth were knocked out and his arm broken during his interrogation.
Then he says his eldest son was taken and also tortured. Next they came for his youngest boy - only 12 years old - who was subjected to similar treatment: his arms were burnt with melted plastic and cigarettes.
http://news.bbc.co.uk/2/hi/programmes/crossing_continents/6176337.stm