Acting on a tip-off, the police dug out the weapons hidden inside a ditch in a cremation ground in remote Sadiya town bordering Arunachal Pradesh.
The weapons recovered include 16 US-made M-16 rifles, two rocket launchers and huge quantities of magazines of .303 rifle.
The arms were suspected to have been hidden by four Maoist cadre - killed in an encounter with the police in May this year.
