Police resorted to firing late last night after they were attacked with petrol bombs and bricks when they tried to evict cadres of United Democratic Madhesi Front from blocking the East-West Highway of Saptari district, they said.
Following the violent clashes, the authorities imposed an indefinite curfew in the area to safeguard vehicular movement along the East-West highway.
As many as 17 protesters and 25 police personnel were also injured in the clashes. Five protesters and two policemen are reported to be in serious condition.
"We had to use force to disperse the mob of protesters after they inadvertently started attacking the security personnel with homemade weapons," Dhakal was quoted as saying by the Kathmandu Post.
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Madhesis, Indian-origin inhabitants of Nepal's Terai region, are protesting against division of their ancestral homeland into seven provinces in the new Constitution.
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