Six persons were arrested in this connection, a police officer said.
A police patrol intercepted a vehicle on NH-2 and seized a pouch of uranium and a packet of heroin weighing one kg, Superintendent of Police Manu Maharaj said.
Six persons, identified as Firoz Khan, Anwarul, W Kumar, Bachchu Singh, Rajesh Singh and Md. Sayeed alias Asif, all said to be members of an international smugglers gang, have been arrested, he said.
The seized contraband substance was valued at Rupees six crore in international market, Maharaj said.