Petrol bombs were hurled at the GJM office in the early hours, the police said, adding that the entire office was gutted.
This was the first instance of a GJM office being attacked since the party called the indefinite shutdown in the Darjeeling hills.
The GJM leadership accused the police and district administration of attacking its office. The police, however, denied the allegation.
He alleged that this was nothing but an "eyewash" as "no formal communication (in this regard) has reached the GJM".
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"It seems that she (Banerjee) is misleading not only the GJM but the entire population of Bengal. It shows that she is not sincere and honest in her statements, acts and deeds and is reluctant to find out an amicable solution (to the crisis). She is rather trying to camouflage the scenario with a double standard strategy," alleged Giri.
"The GJM still feels that the long-pending issues of the Gorkhas should be attended to without further delay by both the state and central governments," said Giri.
Asked by PTI if the GJM was ready for talks with the state government, he said, "Only party supremo Bimal Gurung can answer your question."
Condemning the incidents of looting and torching the vehicles carrying essential commodities to the hills, Giri said, "It is being said that these incidents were the handiwork of masked miscreants. In reality, these were efforts to damage the image of the democratic agitation by the GJM and create a sense of fear among the masses."
The GJM leader alleged that the state government and police had "let loose a reign of terror through indiscriminate arrests and slapping of non-bailable charges" against the activists of the party.
Senior Trinamool Congress (TMC) leader Gautam Deb, however, dismissed the allegations levelled by Giri as "completely baseless".
"We had earlier told them to shun violence and sit for talks, an offer they declined. Our government wants peace in the hills. What violence are they (GJM) talking about? What have they done over the last two months in the hills?" he asked.