Four policemen were suspended on Friday after a prisoner fled from Khagrachhari hospital where he was undergoing treatment in police custody.
Superintendent of Police Md Abdul Aziz said a three-member probe body was formed and four cops were suspended over the matter.
Legal action will be taken against the cops if the investigation found them guilty, he said.
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Early Thursday, Erako Chakma, an accused in a case filed over theft, fled from Khagrachhari Sadar Hospital.
He was arrested again after about 15 hours from Rubberdam area of Panchhari upazila.