Fresh clashes erupted and GJM supporters threw stones forcing police to lathicharge, use teargas shells.
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Son of a senior Gorkha Janmukti Morcha leader arrested
Security forces used lathicharge after GJP supporters threw stones
Army has been called in to control situation
As GJM supporters threw stones, bottles and even petrol bombs at security forces prompting them to lathi-charge and use teargas shells, West Bengal Chief Minister Mamata Banerjee called it a conspiracy and said that "insurgency groups are supporting the GJM".
"Whatever is happening is a deep-rooted conspiracy," Ms Banerjee told reporters at a briefing.
The Chief Minister had initially said Assistant Commandant Kiran Tamang of the India Reserve Battalion was stabbed to death by the protesters. But she later clarified that he was critically injured.
The Army had to be called in to control the situation. The police are on high alert and security forces are conducting route marches in various parts of the hills.

The ongoing agitation in Darjeeling has crippled tourism in the hills. (PTI)
"We are shocked that Vikram Rai, a local journalist, was arrested last night. Rai is associated with various media houses in Kolkata. If journalists are not safe in Darjeeling, who is," Mr Tamang said and added, "There is a virtual emergency imposed in Darjeeling region."
A public works department office in Bijonbari was also allegedly set on fire by GJM supporters at 1 am. GJM supporters threw stones and petrol bombs at the home of Trinamool Congress activist Deoraj Gurung on Lebong Cart Road and attempted to set the house on fire, claimed Mr Gurung.

Security personnel patrol a road during GJMs strike in Darjeeling on Friday. (PTI)
The GJM announced an indefinite general strike from Monday in the hills encompassing Darjeeling and Kalimpong districts and the Dooars (foothills of the Himalayas covering stretches of Jalpaiguri and Alipurduar district) protesting against Chief Minister Mamata Banerjee's decision to make Bengali language compulsory in state-run schools, but it has now escalated to the decades-old demand for a separate state of Gorkhaland.
The strike was called even as the Chief Minister assured that the new rule would not be imposed in the hill districts.
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