New Delhi: A Delhi court on Friday issued fresh death warrants for February 1, 6 am against the four convicts in the Nirbhaya gangrape and murder case.The development came soon after President Ram Nath Kovind rejected a convict’s mercy petition.Additional sessions judge Satish Kumar Arora was hearing a plea by one of the four death row convicts in the case, Mukesh Kumar Singh, seeking postponement of the date of his execution scheduled for January 22.Earlier in the day, the Tihar jail authorities sought the issuance of fresh death warrants against the four convicts.Public prosecutor Irfan Ahmed told the court that Mukesh’s mercy plea was rejected by the president on Friday.The four convicts – Mukesh Singh (32), Vinay Sharma (26), Akshay Kumar Singh (31) and Pawan Gupta (25) – were found guilty of raping and murdering a 23-year-old paramedic student, referred to as Nirbhaya. She was gang-raped and assaulted on the intervening night of December 16-17, 2012 inside a moving bus in south Delhi by six persons before being thrown out on the road.She died on December 29, 2012 at Mount Elizabeth Hospital in Singapore.(With PTI inputs)