The CBI will question at least twoformer officials of the Prime Minister's Office who were involved in the processing of the file related to coal block allocation to Hindalco.

Agency sources said the two senior officers would be examined for understanding the reasons which resulted in changing the decision on Hindalco, whose application for Talabira coal block was rejected by the 25th screening committee.

Refusing to give names, the sources said the agency would soon serve them notices for questioning.

CBI sources said they have received the file related to Hindalco from the Prime Minister's Office which is crucial to understand the public good cited as the reason for reversing the decision.