They added that Gurung may even use a "human shield" to make it hard for the police to open fire. The police did not comment on this.
Gurung's supporters said the police were behind the incident.
By now, it is clear that Gurung has lost popular support in Darjeeling, said Anuj Sharma, additional director general of police (law and order).
ADG Sharma said the police, which faced "heavy fire power" from the group, retaliated. Weapons used to attack the police were procured from them. The body had summoned him to be present at the child rights body's headquarters on August 17 for using children in political rallies during school hours on May 29 and June 3 but Gurung remained absconding and in hiding in Sikkim.
Restrictions have been imposed on entry to the village, a Gurung stronghold, and police are conducting raids in the area. We will not allow this to happen at any cost, even if we have to make sacrifices, he said. Clashes broke out after West Bengal police raided GJM's den stock house in Darjeeling. 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 today, Sharma told reporters here.
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Though Union home minister Rajnath Singh appealed to Gurung to withdraw the indefinite strike in Darjeeling, the Centre must now decide if it wants to involve a "fugitive" in the discussions, said an officer in Kolkata, asking not to be named.
The cause of the fire or casualties due to it are yet to be ascertained and investigations are on. The protests ended on September 27 when the GJM agreed to hold talks with the state government.
The West Bengal government will do all that is necessary to arrest Gurung, he added.
The GJM is an ally of the BJP-led National Democratic Alliance (NDA).