An elderly man was beaten to death by criminals at Lafaidong in Manikchhari upazila of the district on Wednesday night. The deceased was identified as Abdul Matin, 80, a resident of the same area. Police arrested Repruchai Marma, 48, and Ushimong Marma, 38, from the same area for their alleged involvement in the incident. Confirming the incident, Officer-in-Charge of Manikchhari police station Safiqul Islam said criminals beat Matin to death at night while he was sleeping at his residence. As the news spread local people blocked the Khagrachhari-Chittagong road for three hours from 10:00am demanding arrest of the criminals. The reason behind the killing could not be known immediately, the OC said.