Darbhanga's Senior Superintendent of Police (SSP) A K Satyarthi said six persons were detained from a housing colony under Laheriasarai police station area in Darbhanga town for interrogation.
He said Baheri police station's Station House Officer (SHO) Rama Shankar Singh, under whose jurisdiction the shocking incident took place yesterday, has been suspended on charge of dereliction of duty.
Meanwhile, IG, Special Task Force (STF) Sushil M Khopde and its SP Shivdeep Lande inspected the site where the two engineers Brajesh Kumar and Mukesh Kumar were fatally shot at by unidentified gunmen yesterday.
The leaflets warned about carrying out more such activities, he said.
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The IG said the STF teams were carrying out raids in Muzaffarpur, Sitamarhi and Darbhanga districts to nab the culprits.
The two engineers of a road construction firm M/S BSCCNC were fatally shot at by motorcycle-borne assailants in broad daylight near Shivram Chowk on Darbhanga-Kusheshwarsthan State Highway yesterday.
The injured engineers were rushed to Darbhanga Medical College and Hospital (DMCH) but the attending doctors declared them as brought dead.