The Belfast Telegraph reports
Police said the operation was part of an ongoing effort to target large scale importations of drugs at harbours and ports.
The discovery of cocaine and cannabis with an estimated street value of £3 million is one of the biggest drugs seizures in Northern Ireland, police have said.
Detectives initially discovered £1.8 million of class A and class B drugs when they stopped a lorry at Belfast Harbour in the early hours of February 12.
However, follow-up searches of the vehicle have now uncovered another £1.2 million worth of drugs hidden under the floor of the trailer.
Detective Inspector Conor Sweeney from the PSNI Organised Crime unit said the operation was part of an ongoing effort to target large scale importations of drugs at harbours and ports.
He said: “Initial searches uncovered approximately £1.8 million of drugs. Since then further searches have located, concealed under the floor of the trailer, an additional approximately £1.2 million worth.
“That is both class A cocaine and class B cannabis and a combined value of roughly £3 million.
“It is obviously a very significant seizure. It is actually one of the largest single seizures that we have had.”