Haryana Police has arrested two persons allegedly involved in a double murder case in Chhapra in Bihar. They were identified as Prem Kumar and Om Prakash, both sons of Mohit Prashad, a resident of Patrai village in Chhapra district. Bihar police has been informed about it.A Haryana Police Spokesman said in Chandigarh that they were arrested during a combing operation being carried out in connection with Municipal Corporation of Gurgaon elections to be held on Sunday.