The GJM claimed three of its supporters were killed in police firing.
The police conducted the raid after getting information that Gurung was hiding in the area, during which the GJM leader's supporters fired and pelted stones, police said.
Sharma also said they have received information that Bimal Gurung has links with North-East insurgent groups and Maoists. "We have recovered six AK-47 assault rifles, one 9 mm pistol, 500 rounds of ammunition and bombs from the place where a police party was ambushed by his group near Darjeeling on Friday", Sharma told reporters.
"Gurung has procured arms from them", he said. The report said besides the killing of SI and injury to four policemen, a Gorkha Personnel (GLP) activist was killed in the cross-fire.
The hills, after much struggle and suffering had returned to peace just a few days back on 27 Sep and just as the people were trying to be relaxed that finally there is peace, another incident disturbed the people of Darjeeling, forcing them to live under the feeling of fear.
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Meanwhile, the police said that it had intelligence inputs that Gurung was hiding near Patlebas.
ADG Anuj Sharma also said that the attempts to disturb the hills' peace will go in vain since the police is determined to stop the miscreants who would do so, even if it would mean that the lives of the police officials would have to be sacrificed. "We don't want any unrest, we want peace and are appealing to all to maintain peace in the hills", Tamang said on reaching Kolkata to attend a meeting with chief minister Mamata Banerjee later in the day.
Bimal Gurung, the leader of GJM, is wanted by the Bengal government over deadly clashes.
The GJM is an ally of the BJP-led National Democratic Alliance (NDA).