New Delhi, Jan 19:  The CBI on Wednesday registered a preliminary enquiry (PE) against Delhi Deputy Chief Minister Manish Sisodia and some unnamed state government officials to probe alleged irregularities in the "Talk To AK" campaign.

 
 "We have filed a PE against Sisodia and other unknown government officials, as there are allegations of improprieties and violation of extent rules and regulations in award of work pertaining to media campaign 'Talk To AK'," a Central Bureau of Investigation (CBI) official said.
 
 The campaign was an interactive session of Delhi Chief Minister Arvind Kejriwal, under which people could reach out to the Aam Aadmi Party leader through social media.