The Karnataka police investigating the murder case of Mohammad Fazil Mangalpet have arrested four persons. Police sources said that the accused have been picked up from various places, including Uttara Kannada and Bengaluru. The police department had formed a special team to nab the killers headed by an ACP rank officer. Police had seized the car used for carrying out murder and arrested the owner of the vehicle Ajith Crasta (40). Sources said the police are confident of cracking the case as they have got definite clues on the gang of murderers. They suspected the role of gang headed by Suhas, who was earlier involved in a murder and attempt to murder cases.