"We have arrested one person from Kalimpong today in the early morning. He was involved in the blast outside Kalimpong police station," a senior police official said.
GJM chief Bimal Gurung and a few other GJM leaders were booked under the Unlawful Activities (Prevention) Act (UAPA) following the grenade blast.
An indefinite shutdown is on in the hills since June 15 over the demand of a separate state of Gorkhaland.
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