Manjhi told reporters that according to information he received, the SHO was not killed while escorting employees of a petrol pump in depositing money in a bank but when he was frisking three motorcycle-borne youths.
The SHO Sanjay Kumar Tiwary (40) was yesterday shot dead at Shamkauria under Isuapur police station while on duty.
Manjhi said he has already announced a compensation of Rs 10 lakh for the kin of the SHO.
"The murder of an SHO in uniform by criminals in broad day light proves that law and order situation has dipped in Bihar," Yadav told reporters in his Assembly chamber.
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Senior BJP leader and former minister Prem Kumar today gave an adjournment notice in the Assembly on the murder of SHO and the incident of scuffle between RJD MLA Surendra Yadav and traders on December 14. But, the notice was not entertained by Speaker Udai Narayan Chaudhary.
Janak Singh, BJP MLA from Taraiya in Saran district where the killing took place, had also given an adjournment notice on SHO murder. He said he has demanded a compensation of Rs 30 lakh for the SHO's family.
Superintendent of Police Satyabir Singh said that those detained were being questioned to crack the murder.