The dead were identified as Azadul Islam, 50, forest ranger of Sylhet Forest Division, and Sufia Khatun, 60, elder sister of another forest official Saiful Islam.

Their companion, Aziza Islam Moyna, 35, was seriously injured.

Md Emdad, younger brother of Sufia Khatun, yesterday filed a case with the Khulshi Police Station, accusing the Concord authorities of mismanagement.

"I along with my elder sister Sufia, other relatives and colleagues went to the park at around 4:00pm on Saturday and boarded different boxes on the Ferris wheel," Banshkhali Range forest official Saiful Islam told reporters.

"One of the 18 boxes suddenly developed some technical faults and started to turn upside down. My sister, colleague Azad and relative Aziza Islam screamed for help, but there was no operator to stop the wheel. As it reached the highest altitude at around 50 feet, it turned completely upside down and the three fell down straight on the ground," Saiful said.

The three with serious head injuries were immediately taken to Chittagong Medical College and Hospital (CMCH), where the doctors declared Sufia and Azad dead.

Aziza, still in a critical condition, was undergoing treatment, hospital sources said.

Meanwhile, following the incident, the park staffs and employees fled the scene. The visitors stopped the Ferris wheel and rescued 64 other riders.

Deputy General Manager of the park Zakaria Chowdhury denied any technical fault and claimed that it was Sufia Khatun's saree that caused the accident.

"A part of her saree suddenly got stuck in the box of the Ferris wheel and when she leaned over the box to release it, the box turned upside down and they fell on the ground," he said.

Sources said Sylhet forest official Azad from Natore came to Chittagong to celebrate the Eid with family members residing in the port city.

Sufia Khatun also came to Chittagong from Joypurhat to celebrate the Eid with her two younger brothers.