Two persons, including a female student, were killed and two others injured in separate accidents in the city, police said on Friday.

The deceased were identified as Samanta Alam Jyoti, a 19-year-old second-year mechanical engineering student of UCEP Institute of Science and Technology (UIST), and Kazi Aminul Haque, 35, son of Kazi Alimul Haque and a resident of Mohakhali.

The first accident occurred in the Mirpur area around 1am when Jyoti was returning home in the Diabari Bazar area from the UIST campus riding pillion on her friend Niloy's bike, her father Nurul Amin said.

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"Niloy lost control of his bike as a speeding truck zipped past. Both the riders fell off the bike and sustained serious head injuries," said Aminul Islam, a sub-inspector at Darus Salam police station.

Locals rushed them to Shaheed Suhrawardy Medical College and Hospital and they were later transferred to Dhaka Medical College Hospital (DMCH). At DMCH, Jyoti died of her around 1.45am, the officer said.

Niloy, a fourth-year student of UIST, is currently being treated at DMCH, while the body of Jyoti has been sent for an autopsy, said SI Aminul.

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The second accident occurred around 2am when a man named Aminul riding his bike home crashed into a road island near Bangladesh College of Physicians and Surgeons (BCPS) in the Mohakhali area at cruise speed, said Saiful Alam, a sub-inspector at Banani police station.

Aminul died on the spot while his neighbour Sumon riding pillion was admitted to DMCH in a critical condition, said the officer. "The body has been sent for an autopsy."