The Gorkha Janmukti Morcha supporters threw petrol bombs at a revenue department office and a panchayat office, reducing them to ashes, the police said.
The Supporters of the GJM and other hill parties also held a demonstration today outside the district magistrate's office demanding restoration of Internet services which remained suspended for the last 32 days.
The Army, meanwhile, was withdrawn from the restive hills after the state government sought its pull-out on July 18, a defence official said today.
Meanwhile, a delegation of various hill parties met West Bengal Governor K N Tripathi today and submitted a memorandum regarding the situation in the hills.
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While talking to reporters later on the sidelines of a programme, Tripathi said, "They came to meet me. I have told them to create an atmosphere so that normalcy could be restored in that area."
Some political party activists, dressed in traditional Nepali attire, took out rallies in the morning.
All shops, restaurants, hotels, schools and colleges remained closed except pharmacies.