"An FIR has been registered against Geelani and other unnamed persons under Sections 124A (sedition), 120B (criminal conspiracy) and 149 (unlawful assembly) of IPC in connection with the event at the Press Club in which anti-India sloganeering took place," DCP (New Delhi) Jatin Narwal said.
Later, Delhi Police Commissioner B S Bassi said, "Police are gathering details so that those involved in the case can be arrested at the earliest."
The police today claimed to have registered the sedition case against Geelani and others after taking suo motu cognisance of media clips of the incident. "By the time we registered the case, we had received no complaints from any party," Narwal said.
Police also claimed that Geelani was booked as he is presumed to be the main organiser of the event. "Request for booking a hall at press club was done through Geelani's e-mail and the nature of the event was proposed to be a public meeting," Narwal said.
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"We are monitoring video footage and trying to ascertain the identity of the ones involved in anti-India sloganeering," Narwal said.
Later in the day, the police questioned Delhi University professor Ali Javed, the member of the club who had booked the premises for the presser, at the Parliament Street police station.
Javed had distanced himself from the event saying he does not approve of the sloganeering and he was not one of the organisers. Press Club of India yesterday issued a show-cause notice to Javed.
The police also asked Geelani to join the investigation at the earliest, a senior official said.