New Delhi, Jan 13 (Agencies): CBI on Thursday approached the Supreme Court seeking shifting of the trial in Sohrabuddin fake encounter killing case outside Gujarat, saying relatives of some accused were prosecutors and judges in the lower judiciary.

In the petition, the investigating agency has said the surcharged atmosphere in the trial court because of the presence of supporters of former Gujarat Minister Amit Shah and former police officials was another ground for transfer of the case outside the state.

CBI has also alleged witnesses have been threatened and kidnapped in the past, making it impossible to hold free and fair trial in the state.

The agency alleged since high-profile people are accused in the case, several types of pressure tactics were being employed to derail investigators from reaching the real culprits.

During the last hearing on December 14 last, the apex court had questioned CBI for making the plea for shifting the trial of case without filing a proper petition.

"The homework is not done fully. The application has not been filed (seeking shifting of the case outside the state)," a Bench comprising Justices Aftab Alam and R M Lodha had said.