The home-guard was set on fire at Prakriyathong by 'miscreants' and was hospitalised, police sources said.
Suraj Tamang, a GJM trade union leader was found murdered at Hebong, about 8 km from here.
Police sources today said the body of Tamang had many wounds and he was probably killed last night.
The exact cause of death would be ascertained at the postmortem examination, the sources said.
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A forest bungalow at Takdha, where West Bengal Chief Minister Mamata Banerjee had put up during a visit to Darjeeling on January 9 this year was burnt down last night, the sources said.
A truck and an SUV were torched at Mongpo, while disused police booths at Ranglirangliyat and Rangamancha were set ablaze last night, the sources said.
GJM General Secretary Roshan Giri, who left for Delhi at the head of a six-member team, told reporters before his departure that the GJM was not responsible for the incidents of arson and put the blame on opposition parties in the hills.