JERUSALEM (AFP) - Members of Palestinian president Mahmud Abbas Fatah party asked Israel to attack rival Palestinian movement Hamas in 2007, diplomatic cables leaked by whistleblower WikiLeaks show. The latest batch of cables quote the head of Israels Shin Bet security agency as telling US officials that demoralised Fatah officials in the Gaza Strip had asked for help against the growing strength of Hamas. They are approaching a zero-sum situation, and yet they ask us to attack Hamas, Shin Bet chief Yuval Diskin told US officials. They are desperate. He went on to praise his organisations very good working relationship with Abbas security service, which he said shared with the Shin Bet almost all the intelligence that it collects. They understand that Israels security is central to their survival in the struggle with Hamas in the West Bank, he said during the June 2007 meeting. Revelations of such close collusion with Israel against fellow Palestinians is likely to embarrass Abbas and Fatah.