NEW DELHI: Delhi Police has registered two separate cases on complaints by Delhi Commission for Women Chief Barkha Singh over alleged inappropriate tweets on her by AAP leader Kumar Vishwas and in connection with the purported misbehaviour by his supporters at a DCW press conference.The first FIR was filed at Safdarjung Police Station in south Delhi while the second FIR was registered at IP Estate Police Station in central Delhi. Both the FIRs have been filed against unknown persons although Vishwas will be made a witness in the first case, police said today.Barkha Singh had on May 14 approached the Lt Governor and Delhi Police seeking "stringent" action against AAP leader Kumar Vishwas, alleging that he was behind the posting of a series of "inappropriate" and "objectionable" tweets on her."We had registered an FIR in this connection under section 66(A) of the IT Act at Safdarjung Police Station. Kumar Vishwas will be a witness in this case as he had retweeted some tweets," said Delhi Police spokesperson Rajan Bhagat.Another FIR has been registered under sections 506 (criminal intimidation) and 509 (act intended to insult the modesty of a woman) of IPC at IP Estate Police Station in connection of the alleged misbehaviour by AAP workers at a DCW press conference. Further investigations are underway, he said.Earlier this month, the DCW chief had issued summons to Vishwas after an AAP volunteer accused him of not rebutting "rumours" about an illicit liaison with her and ruining her reputation."Mr Kumar Vishwas is threatening me through his cohorts and is sending number of tweets. The tweets are so highly objectionable and undignified that after reading them one will hang his or her head in shame," Singh had said in letters to Lt Governor Najeeb Jung and Delhi Police Commissioner B S Bassi."These objectionable and bad tweets against woman of dignity and high reputation like me definitely invite stringent legal action against Kumar, who is directly or indirectly defaming me through Twitter...just because the Commission summoned him on the basis of a complaint of a distressed woman," the letter had added.