"The Hills will be closed on Saturday and Sunday to condemn the unwanted arrests of GJM leaders," GJM chief Bimal Gurung said in a Facebook post.
The GJM president in a separate post also said that the two-day 'ghar bahira janata' (people on the streets) agitation from today would continue indefinitely till those arrested were released and the cases against them withdrawn.
At a public meeting Gurung said, "The strike will continue until the leaders are released. There will be no relaxation even on Saturday and Sunday. Today they were arrested, tomorrow I may have to go to jail, but our movement will continue."
He also announced that 721 GJM leaders and members of GJM who were in judicial custody would go on an indefinite hunger-strike.
More From This Section
Demanding central intervention, he said, "We will not talk to Mamata Banerjee. The Centre has to intervene. We can talk to the Governor."
Another GTA member and GJM leader Satish Pokhrel, was arrested along with Tamang, besides two others, the sources said.
The four were produced in a court in Kalimpong and remanded to 14 days judicial custody.
With the arrest of Tamang and Pokhrel, 13 GTA members have been arrested since the indefinite bandh began on August three.
The high court had on August 14 expressed displeasure over the GJM's violation of its order of August 7 which had held the indefinite bandh in Darjeeling as illegal.