Six people died after two blasts went off within minutes of each other on Sunday outside a police station in Nalbari, a town near the state capital, Gauhati, a local police official said.
Two bombs have exploded in India's northeastern Assam state, killing six people and wounding dozens more, police say.
Up to 25 people have been wounded in the blasts.
Bhaskar Mahanta, Assam's police chief, said authorities suspect the separatist group United Liberation Front of Asom, or Ulfa, is behind the blasts. No group has claimed responsibility.
A senior Ulfa leader, however, telephoned local newspaper offices and television stations to deny its involvement.
Mahanta said the bombers had parked two bicycles fitted with carriers packed with explosives outside the Nalbari police station, which is located in a congested part of the town. These went off, killing passers-by and wounding the others.
Mahanta said police had received intelligence reports suggesting that the Ulfa was planning to avenge last week's arrest of two of the group's leaders.
The blasts came soon after New Delhi announced the government will provide safe passage to separatist leaders willing to talk and find a lasting solution to the state's problems.
Last week, suspected Ulfa fighters triggered a powerful explosion, derailing a freight train and setting more than a dozen oil-tanker railway cars on fire in Assam.
India's northeast is beset by scores of conflicts. More than 10,000 people have died in separatist violence over the past decade.
The region is home to dozens of separatist groups who accuse the Indian government of exploiting the area's natural resources while doing little for the indigenous people.
Two bomb explosions in the northeastern Assam state of India have killed at least seven people and injured 25 more today.

The blasts, which happened within several minutes of each other, occurred outside of a police station in the town of Nalbari, 70 kilometres from the state capital of Guwahati. According to security officials, the explosives were attached to bicycles.

Police believe that the separatist rebels from the United Liberation Front of Assam (ULFA) were behind the bombings, but a senior ULFA member denied that the group carried out the attacks. Nobody has yet claimed responsibility.

There were reports of another explosion nearby soon after the first to explosions; however, they have not been officially confirmed.