<p>The Central Bureau of Investigation (CBI) Thursday filed a preliminary enquiry into the allocation of coal blocks since 1993, officials said.<br /><br /></p>.<p>"The preliminary enquiry is against unknown public servants and certain private firms," said sources in CBI.<br /><br />The agency, which is already probing coal blocks allocation during the period 2006-2009, registered the new preliminary enquiry on Central Vigilance Commission's (CVC) reference to enquire into alleged irregularities in allotment of coal blocks from 1993 to 2004.</p>
<p>The Central Bureau of Investigation (CBI) Thursday filed a preliminary enquiry into the allocation of coal blocks since 1993, officials said.<br /><br /></p>.<p>"The preliminary enquiry is against unknown public servants and certain private firms," said sources in CBI.<br /><br />The agency, which is already probing coal blocks allocation during the period 2006-2009, registered the new preliminary enquiry on Central Vigilance Commission's (CVC) reference to enquire into alleged irregularities in allotment of coal blocks from 1993 to 2004.</p>