During primary interrogation, he admitted that he was behind the steering when the accident took place.
The couple -- Akash Iqbal and his wife Maya Hazarika -- were on their way to work when the bus hit their motorbike around 7:30am.
The husband and wife were thrown onto the highway and the bus driver, attempting to escape, drove over them, sub-inspector Imran Hossain of Airport Police Station, who is investigating the case, said earlier.
The couple have a five-year-old daughter Afra Anjum.
CID official Mukta said Tasikul in primarily interrogation claimed he could not see clearly as there was fog on that day.