"Time has come to kill Anna Hazare. I will be next Nathuram Godse," NRI Gagan Vidhu wrote on the social networking site, police said today.
Ashok Gautam, a resident of Kalyan near Mumbai and a Hazare supporter, too received messages in his account threatening to harm the Gandhian over the past three weeks following which he lodged a complaint last night, Inspector D M Katke of Mahatma Phule Chauk police station told PTI.
Hazare is scheduled to hold a meeting of his supporters at Sevagram in Maharashtra's Wardha district on March 9 where he is likely to announce the date for commencement of the march from there to Ramlila Maidan in Delhi against the land bill.
Hazare had earlier said his 1100-km foot march against the "anti-farmer" move will span over three months.
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Police is trying to trace the IP address from where the threat was issued besides carrying out a detailed probe with the help of the cyber cell of the police commissionerate here.
Noticing the Facebook post, Hazare's office had written to the state police headquarters a few days ago and sought a probe. In the meantime, Gautam approached Thane police with a complaint following which an FIR was registered.
Meanwhile, under fire for yet-to-be solved murders of rationalist Narendra Dabholkar and veteran CPI leader Govind Pansare, Maharashtra Police has beefed up the security of the 77-year-old social activist at his residence in Ralegan Siddhi in Ahmednagar district.