Mustakim, who was absconding since last last June 27 incident, surrendered before a court a few days ago. He was sent to judicial custody.
Yesterday, he was booked under the NSA for the violence at Khalapar, District Magistrate Rajive Kumar Sharma said.
The police team was attacked on June 27 last year when they had gone to arrest three men in a cow slaughter case. Four policemen were injured and a police vehicle was damaged in the incident.
The mob had freed three accused, including Mustakim, by stone pelting. Police had registered two cases and arrested two dozen people in this connection so far.
In February, another accused Inayat was also booked under the NSA.
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