Six people, mostly non-Assamese, were injured in the attacks by ULFA at two places in the town, additional superintendent of police (security) Amitav Sinha told PTI over phone from Tinsukia.
He said a tense situation prevailed in the township when people feared that a bomb planted by the ULFA had exploded, which turned out to be a hoax, he said.
Panic prevailed and shopkeepers downed their shutters, but security measures have been tightened since then.
The injured have been admitted to the local hospital.