A case was filed yesterday against ten unidentified people in connection with the killing of two staff of Bonoful Company. The case was filed by Masud Pervez, brother of victim Razu Miah with Shahparan Police Station on Friday night. Later police arrested three suspects for interrogation; the name of trio was not disclosed by police yet.  Local people blocked the Sylhet-Tamabil road in Kadimnagar area around 10 am on Saturday morning protesting the incident. Later they withdrew the programme after assuring the protester by police to arrest the killer at immediately. Earlier, on Friday two staff of Bonoful Company Raju, 19 son of Harun Rashid from Chandpur and Abu Miah,25 from Shariatpur were stabbed to death by some miscreants on Friday night at 7.30pm in Kadimnagar area of the city.