The 10-member Central Bureau of Investigation (CBI) team in Kunda, Uttar Pradesh has appealed to villagers to come forward as witnesses in its probe into the murder of senior police officer Zia-ul-Haque, who was shot dead on March 2. In a press release, the CBI, which has set up a camp office and a helpline number in Pratapgarh, has assured the villagers against any kind of harassment.