The hydraulic brakes caught fire as soon as the driver pressed them at a station
Ali Azam, 48, and his wife Samna Khatun, 35, were killed when a microbus coming from the opposite direction rammed into the auto-rickshaw they were travelling in.
The accident occurred around 10:15am on Wednesday, Sub-Inspector Lutfur Rahman of Lalmai Highway Police Camp told bdnews24.com.
Three other passengers of the auto-rickshaw were injured. They were admitted to the Comilla Medical College Hospital.
The bodies of the dead and the mangled auto-rickshaw have been kept in the police camp.