Acting on a tip-off, a Special Operations Group of the district police intercepted the truck, carrying four smugglers in Shivkuti area of the city, they said.
The smugglers, identified as Trilochan and Janmejay Sahu, both hailing from Jajpur district of Orissa and Niranjan Sahu from Khurd district of the state were arrested along with the narcotics, police said.
However, their fourth accomplice managed to flee the spot, they said.
During interrogation, the trio admitted that they were taking the drugs to the neighbouring district of Mirzapur from where they intended to sell it to various dealers.
The accused has been booked under the relevant sections of NDPS Act while a manhunt has been launched to nab the absconding smuggler.