A woman and a five-year-old boy died after a truck hit a motorcycle they were on at Bochaganj Upazila of Dinajpur on Wednesday afternoon.
The deceased were identified as Champa Rani Roy (26) of Jalgaon village of the upazila and her nephew Joy Chandra Roy (5) of the same village.
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Witnesses said the aunt and nephew died while returning home on the motorcycle after shopping in the market.
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A doctor declared them dead when they were taken to the Upazila Health Complex, said Bochaganj Police Station Sub-inspector Raja Mia.
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Bochaganj Police Station in-charge Abu Bakar Siddique Rasel said they detained truck driver Aminul Islam and seized the truck.