The armed separatism of the 1990s had largely faded away, but a peace accord never followed. Frustration had been mounting in recent weeks over an execution and an expansive policing law.
The explosions, which injured scores of market goers, come amid ongoing tensions in India over its recent execution of convicted terrorist Mohammad Afzal Guru.
Hoping to defuse activist Anna Hazare's anti-corruption crusade, the government initiated debate on a bill to create an anti-graft watchdog. But Parliament could not come to agreement.