Bangladesh Road Transport Authority yesterday suspended the registration of a passenger bus that continued travelling for several kilometres even after its roof was torn off in a series of collisions on Dhaka-Mawa Expressway in Sreenagar upazila of Munshiganj on Thursday night.

BRTA also served a notice yesterday to owner of the Barishal Express bus seeking an explanation as to why its registration should not be permanently cancelled.

Md Sanaul Haque, deputy director (engineering) of BRTA's Dhaka Metro-2 Circle (Ekuria), issued the notice.

According to the letter, the speeding bus rammed into a private car on Kamarkhola Rail Flyover of the expressway, before colliding with a covered van. The front of the bus was severely damaged.

Noticing police and army vehicles behind, the driver reportedly panicked and drove recklessly. The bus later hit the expressway railing at Samashpur, causing its entire roof to be torn off. Despite the damage, the driver continued to drive the vehicle with 60 passengers on board. Eight passengers were injured in the incident.

The BRTA letter directed the owner to appear in person at its Dhaka office with the vehicle's necessary documents.

Meanwhile, a case under the Road Transport Act has been filed on Friday against the bus owner as it did not have a valid fitness certificate.

[Our Munshiganj correspondent contributed to this report]