At least two blasts occurred at a Muslim graveyard after Friday prayers in the western Indian town of Malegaon.
People had been attending prayers for the dead when the explosions occurred.
Several dozen people died and scores more were injured in the explosions.
The capital of Maharashtra state, Mumbai, was put on high alert following the blasts.
Police said a curfew had been imposed in Malegaon and reinforcements had been sent to the town.