State Home Secretary S K G Rahate said a probe has been ordered into the two incidents of vigilantism in Rajnagar in Seraikela-Kharswan district and Nagadih in Jamshedpur, that claimed four and three lives respectively.
The lynchings were allegedly sparked by suspicions that the victims were child lifters.
18 persons were arrested today in connection with the lynching incident at Nagadih on May 18, and the subsequent violence on May 20.
The other two were held yesterday in connection with the lynching of four persons of a community in Seraikela-Kharswan.
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The report of the probe, to be conducted by the Kolhan division commissioner and DIG, would be submitted within a month, he said, adding that an FIR has also been lodged.
He said the incidents were triggered purely by rumours and villagers, in an act of vigilantism, took the law into their lands.
A Jamshedpur report quoting an official release said the Kolhan DIG Prabhat Kumar has been asked by the home department to suspend the officers-in-charge of Rajnagar police station and Bagbera police station with immediate effect.
Raids were on to apprehend the other culprits involved in the two incidents, Kumar said, adding that security forces, including a company of RAF have been deployed in the two areas.
The Deputy Commissioner of East Singhbhum district Amit Kumar has sought the cooperation of the people to share information about the miscreants, including their photos on social media and promised to protect the identity of those providing it.