The West Bengal CID on Thursday took over the investigation into the Islampur firing that killed two students during a clash between a mob and the police in North Dinajpur district last week, a senior officer said.
No arrests were made by the police in the case, though a few persons were detained.
Local people have been claiming that the two students died in police firing. However, Chief Minister Mamata Banerjee has said the bullets found in the bodies of the duo were not of the police.
"We have taken over the investigations into the Islampur firing incident. We are trying to find out what actually happened on that day," West Bengal CID DIG (Operations) Nishant Pervez told PTI.
The clash broke out on September 20 during a demonstration over recruitment of Urdu teachers at Dori Bhita High School in Islampur.
Rajesh Sarkar, an ITI student, died in the clash, while a third-year college student Tapas Barman, who was injured in the violence, succumbed to injuries on September 21.
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The BJP called a 12-hour statewide bandh on Wednesday to protest the killings.
North Dinajpur Superintendent of Police Sumit Kumar had said the police did not open fire but he admitted that the deceased students received bullet injuries during the clash.