Another convict was sentenced to five years in prison.
Those awarded 10-year imprisonment include BJP MLA from Parihar Assembly constituency Ram Naresh Yadav, former JD(U) MP from Sitamarhi Nawal Kishore Rai, former Sheohar MP and RJD leader Anwarul Haq, Rashtriya Lok Samata Party (RLSP) district president Ram Lashan Singh Kushwaha and general secretary Mohan Kumar Singh.
One convict Suryadeo Rai, who was a police bodyguard of former MP Nawal Kishore Rai was handed over a 5-year prison term.
All the 15 people, who were already in jail after the conviction, were bought to the court for sentencing. They were taken back to prison in police custody after the extent of punishment was pronounced.
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The case pertains to an incident on August 11, 1998 when the convicted political leaders led a huge crowd after severe floods in the district to demonstrate at Sitamarhi collectorate.
The demonstration turned violent and the people participating in it ransacked the premises, indulged in stone throwing and attacked government officials working there.
The then Sitamarhi district magistrate Ramnandan Prasad and superintendent of police Paresh Saxena had registered an FIR against 60 persons at Dumra Police Station. However, 45 of them were set free by the court in the absence of proof.