Officials in India say gunmen have opened fire on a busy marketplace in the restive northeastern state of Assam, killing at least 12 people.

Authorities say 15 people were wounded in the attack Friday in Kokrajhar, 220 kilometers west of the state commercial capital, Guwahati.

Several assailants were responsible for the attack. The Times of India says the shooters also lobbed a grenade that destroyed three shops.

Officials blame the attack on militants belonging to a Bodo group.

Authorities say one gunman was killed and security forces are searching for others.